diff --git a/lib/pkg_resources.py b/lib/pkg_resources.py
new file mode 100644
index 00000000..79db00b8
--- /dev/null
+++ b/lib/pkg_resources.py
@@ -0,0 +1,2625 @@
+"""Package resource API
+--------------------
+
+A resource is a logical file contained within a package, or a logical
+subdirectory thereof.  The package resource API expects resource names
+to have their path parts separated with ``/``, *not* whatever the local
+path separator is.  Do not use os.path operations to manipulate resource
+names being passed into the API.
+
+The package resource API is designed to work with normal filesystem packages,
+.egg files, and unpacked .egg files.  It can also work in a limited way with
+.zip files and with custom PEP 302 loaders that support the ``get_data()``
+method.
+"""
+
+import sys, os, zipimport, time, re, imp
+
+try:
+    frozenset
+except NameError:
+    from sets import ImmutableSet as frozenset
+
+# capture these to bypass sandboxing
+from os import utime, rename, unlink, mkdir
+from os import open as os_open
+from os.path import isdir, split
+
+
+def _bypass_ensure_directory(name, mode=0777):
+    # Sandbox-bypassing version of ensure_directory()
+    dirname, filename = split(name)
+    if dirname and filename and not isdir(dirname):
+        _bypass_ensure_directory(dirname)
+        mkdir(dirname, mode)
+
+
+
+
+
+
+
+_state_vars = {}
+
+def _declare_state(vartype, **kw):
+    g = globals()
+    for name, val in kw.iteritems():
+        g[name] = val
+        _state_vars[name] = vartype
+
+def __getstate__():
+    state = {}
+    g = globals()
+    for k, v in _state_vars.iteritems():
+        state[k] = g['_sget_'+v](g[k])
+    return state
+
+def __setstate__(state):
+    g = globals()
+    for k, v in state.iteritems():
+        g['_sset_'+_state_vars[k]](k, g[k], v)
+    return state
+
+def _sget_dict(val):
+    return val.copy()
+
+def _sset_dict(key, ob, state):
+    ob.clear()
+    ob.update(state)
+
+def _sget_object(val):
+    return val.__getstate__()
+
+def _sset_object(key, ob, state):
+    ob.__setstate__(state)
+
+_sget_none = _sset_none = lambda *args: None
+
+
+
+
+
+
+def get_supported_platform():
+    """Return this platform's maximum compatible version.
+
+    distutils.util.get_platform() normally reports the minimum version
+    of Mac OS X that would be required to *use* extensions produced by
+    distutils.  But what we want when checking compatibility is to know the
+    version of Mac OS X that we are *running*.  To allow usage of packages that
+    explicitly require a newer version of Mac OS X, we must also know the
+    current version of the OS.
+
+    If this condition occurs for any other platform with a version in its
+    platform strings, this function should be extended accordingly.
+    """
+    plat = get_build_platform(); m = macosVersionString.match(plat)
+    if m is not None and sys.platform == "darwin":
+        try:
+            plat = 'macosx-%s-%s' % ('.'.join(_macosx_vers()[:2]), m.group(3))
+        except ValueError:
+            pass    # not Mac OS X
+    return plat
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+__all__ = [
+    # Basic resource access and distribution/entry point discovery
+    'require', 'run_script', 'get_provider',  'get_distribution',
+    'load_entry_point', 'get_entry_map', 'get_entry_info', 'iter_entry_points',
+    'resource_string', 'resource_stream', 'resource_filename',
+    'resource_listdir', 'resource_exists', 'resource_isdir',
+
+    # Environmental control
+    'declare_namespace', 'working_set', 'add_activation_listener',
+    'find_distributions', 'set_extraction_path', 'cleanup_resources',
+    'get_default_cache',
+
+    # Primary implementation classes
+    'Environment', 'WorkingSet', 'ResourceManager',
+    'Distribution', 'Requirement', 'EntryPoint',
+
+    # Exceptions
+    'ResolutionError','VersionConflict','DistributionNotFound','UnknownExtra',
+    'ExtractionError',
+
+    # Parsing functions and string utilities
+    'parse_requirements', 'parse_version', 'safe_name', 'safe_version',
+    'get_platform', 'compatible_platforms', 'yield_lines', 'split_sections',
+    'safe_extra', 'to_filename',
+
+    # filesystem utilities
+    'ensure_directory', 'normalize_path',
+
+    # Distribution "precedence" constants
+    'EGG_DIST', 'BINARY_DIST', 'SOURCE_DIST', 'CHECKOUT_DIST', 'DEVELOP_DIST',
+
+    # "Provider" interfaces, implementations, and registration/lookup APIs
+    'IMetadataProvider', 'IResourceProvider', 'FileMetadata',
+    'PathMetadata', 'EggMetadata', 'EmptyProvider', 'empty_provider',
+    'NullProvider', 'EggProvider', 'DefaultProvider', 'ZipProvider',
+    'register_finder', 'register_namespace_handler', 'register_loader_type',
+    'fixup_namespace_packages', 'get_importer',
+
+    # Deprecated/backward compatibility only
+    'run_main', 'AvailableDistributions',
+]
+class ResolutionError(Exception):
+    """Abstract base for dependency resolution errors"""
+    def __repr__(self): return self.__class__.__name__+repr(self.args)
+
+class VersionConflict(ResolutionError):
+    """An already-installed version conflicts with the requested version"""
+
+class DistributionNotFound(ResolutionError):
+    """A requested distribution was not found"""
+
+class UnknownExtra(ResolutionError):
+    """Distribution doesn't have an "extra feature" of the given name"""
+_provider_factories = {}
+PY_MAJOR = sys.version[:3]
+EGG_DIST    = 3
+BINARY_DIST = 2
+SOURCE_DIST = 1
+CHECKOUT_DIST = 0
+DEVELOP_DIST = -1
+
+def register_loader_type(loader_type, provider_factory):
+    """Register `provider_factory` to make providers for `loader_type`
+
+    `loader_type` is the type or class of a PEP 302 ``module.__loader__``,
+    and `provider_factory` is a function that, passed a *module* object,
+    returns an ``IResourceProvider`` for that module.
+    """
+    _provider_factories[loader_type] = provider_factory
+
+def get_provider(moduleOrReq):
+    """Return an IResourceProvider for the named module or requirement"""
+    if isinstance(moduleOrReq,Requirement):
+        return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
+    try:
+        module = sys.modules[moduleOrReq]
+    except KeyError:
+        __import__(moduleOrReq)
+        module = sys.modules[moduleOrReq]
+    loader = getattr(module, '__loader__', None)
+    return _find_adapter(_provider_factories, loader)(module)
+
+def _macosx_vers(_cache=[]):
+    if not _cache:
+        from platform import mac_ver
+        _cache.append(mac_ver()[0].split('.'))
+    return _cache[0]
+
+def _macosx_arch(machine):
+    return {'PowerPC':'ppc', 'Power_Macintosh':'ppc'}.get(machine,machine)
+
+def get_build_platform():
+    """Return this platform's string for platform-specific distributions
+
+    XXX Currently this is the same as ``distutils.util.get_platform()``, but it
+    needs some hacks for Linux and Mac OS X.
+    """
+    from distutils.util import get_platform
+    plat = get_platform()
+    if sys.platform == "darwin" and not plat.startswith('macosx-'):
+        try:
+            version = _macosx_vers()
+            machine = os.uname()[4].replace(" ", "_")
+            return "macosx-%d.%d-%s" % (int(version[0]), int(version[1]),
+                _macosx_arch(machine))
+        except ValueError:
+            # if someone is running a non-Mac darwin system, this will fall
+            # through to the default implementation
+            pass
+    return plat
+
+macosVersionString = re.compile(r"macosx-(\d+)\.(\d+)-(.*)")
+darwinVersionString = re.compile(r"darwin-(\d+)\.(\d+)\.(\d+)-(.*)")
+get_platform = get_build_platform   # XXX backward compat
+
+
+
+
+
+
+
+
+
+def compatible_platforms(provided,required):
+    """Can code for the `provided` platform run on the `required` platform?
+
+    Returns true if either platform is ``None``, or the platforms are equal.
+
+    XXX Needs compatibility checks for Linux and other unixy OSes.
+    """
+    if provided is None or required is None or provided==required:
+        return True     # easy case
+
+    # Mac OS X special cases
+    reqMac = macosVersionString.match(required)
+    if reqMac:
+        provMac = macosVersionString.match(provided)
+
+        # is this a Mac package?
+        if not provMac:
+            # this is backwards compatibility for packages built before
+            # setuptools 0.6. All packages built after this point will
+            # use the new macosx designation.
+            provDarwin = darwinVersionString.match(provided)
+            if provDarwin:
+                dversion = int(provDarwin.group(1))
+                macosversion = "%s.%s" % (reqMac.group(1), reqMac.group(2))
+                if dversion == 7 and macosversion >= "10.3" or \
+                    dversion == 8 and macosversion >= "10.4":
+
+                    #import warnings
+                    #warnings.warn("Mac eggs should be rebuilt to "
+                    #    "use the macosx designation instead of darwin.",
+                    #    category=DeprecationWarning)
+                    return True
+            return False    # egg isn't macosx or legacy darwin
+
+        # are they the same major version and machine type?
+        if provMac.group(1) != reqMac.group(1) or \
+            provMac.group(3) != reqMac.group(3):
+            return False
+
+
+
+        # is the required OS major update >= the provided one?
+        if int(provMac.group(2)) > int(reqMac.group(2)):
+            return False
+
+        return True
+
+    # XXX Linux and other platforms' special cases should go here
+    return False
+
+
+def run_script(dist_spec, script_name):
+    """Locate distribution `dist_spec` and run its `script_name` script"""
+    ns = sys._getframe(1).f_globals
+    name = ns['__name__']
+    ns.clear()
+    ns['__name__'] = name
+    require(dist_spec)[0].run_script(script_name, ns)
+
+run_main = run_script   # backward compatibility
+
+def get_distribution(dist):
+    """Return a current distribution object for a Requirement or string"""
+    if isinstance(dist,basestring): dist = Requirement.parse(dist)
+    if isinstance(dist,Requirement): dist = get_provider(dist)
+    if not isinstance(dist,Distribution):
+        raise TypeError("Expected string, Requirement, or Distribution", dist)
+    return dist
+
+def load_entry_point(dist, group, name):
+    """Return `name` entry point of `group` for `dist` or raise ImportError"""
+    return get_distribution(dist).load_entry_point(group, name)
+
+def get_entry_map(dist, group=None):
+    """Return the entry point map for `group`, or the full entry map"""
+    return get_distribution(dist).get_entry_map(group)
+
+def get_entry_info(dist, group, name):
+    """Return the EntryPoint object for `group`+`name`, or ``None``"""
+    return get_distribution(dist).get_entry_info(group, name)
+
+
+class IMetadataProvider:
+
+    def has_metadata(name):
+        """Does the package's distribution contain the named metadata?"""
+
+    def get_metadata(name):
+        """The named metadata resource as a string"""
+
+    def get_metadata_lines(name):
+        """Yield named metadata resource as list of non-blank non-comment lines
+
+       Leading and trailing whitespace is stripped from each line, and lines
+       with ``#`` as the first non-blank character are omitted."""
+
+    def metadata_isdir(name):
+        """Is the named metadata a directory?  (like ``os.path.isdir()``)"""
+
+    def metadata_listdir(name):
+        """List of metadata names in the directory (like ``os.listdir()``)"""
+
+    def run_script(script_name, namespace):
+        """Execute the named script in the supplied namespace dictionary"""
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class IResourceProvider(IMetadataProvider):
+    """An object that provides access to package resources"""
+
+    def get_resource_filename(manager, resource_name):
+        """Return a true filesystem path for `resource_name`
+
+        `manager` must be an ``IResourceManager``"""
+
+    def get_resource_stream(manager, resource_name):
+        """Return a readable file-like object for `resource_name`
+
+        `manager` must be an ``IResourceManager``"""
+
+    def get_resource_string(manager, resource_name):
+        """Return a string containing the contents of `resource_name`
+
+        `manager` must be an ``IResourceManager``"""
+
+    def has_resource(resource_name):
+        """Does the package contain the named resource?"""
+
+    def resource_isdir(resource_name):
+        """Is the named resource a directory?  (like ``os.path.isdir()``)"""
+
+    def resource_listdir(resource_name):
+        """List of resource names in the directory (like ``os.listdir()``)"""
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class WorkingSet(object):
+    """A collection of active distributions on sys.path (or a similar list)"""
+
+    def __init__(self, entries=None):
+        """Create working set from list of path entries (default=sys.path)"""
+        self.entries = []
+        self.entry_keys = {}
+        self.by_key = {}
+        self.callbacks = []
+
+        if entries is None:
+            entries = sys.path
+
+        for entry in entries:
+            self.add_entry(entry)
+
+
+    def add_entry(self, entry):
+        """Add a path item to ``.entries``, finding any distributions on it
+
+        ``find_distributions(entry, True)`` is used to find distributions
+        corresponding to the path entry, and they are added.  `entry` is
+        always appended to ``.entries``, even if it is already present.
+        (This is because ``sys.path`` can contain the same value more than
+        once, and the ``.entries`` of the ``sys.path`` WorkingSet should always
+        equal ``sys.path``.)
+        """
+        self.entry_keys.setdefault(entry, [])
+        self.entries.append(entry)
+        for dist in find_distributions(entry, True):
+            self.add(dist, entry, False)
+
+
+    def __contains__(self,dist):
+        """True if `dist` is the active distribution for its project"""
+        return self.by_key.get(dist.key) == dist
+
+
+
+
+
+    def find(self, req):
+        """Find a distribution matching requirement `req`
+
+        If there is an active distribution for the requested project, this
+        returns it as long as it meets the version requirement specified by
+        `req`.  But, if there is an active distribution for the project and it
+        does *not* meet the `req` requirement, ``VersionConflict`` is raised.
+        If there is no active distribution for the requested project, ``None``
+        is returned.
+        """
+        dist = self.by_key.get(req.key)
+        if dist is not None and dist not in req:
+            raise VersionConflict(dist,req)     # XXX add more info
+        else:
+            return dist
+
+    def iter_entry_points(self, group, name=None):
+        """Yield entry point objects from `group` matching `name`
+
+        If `name` is None, yields all entry points in `group` from all
+        distributions in the working set, otherwise only ones matching
+        both `group` and `name` are yielded (in distribution order).
+        """
+        for dist in self:
+            entries = dist.get_entry_map(group)
+            if name is None:
+                for ep in entries.values():
+                    yield ep
+            elif name in entries:
+                yield entries[name]
+
+    def run_script(self, requires, script_name):
+        """Locate distribution for `requires` and run `script_name` script"""
+        ns = sys._getframe(1).f_globals
+        name = ns['__name__']
+        ns.clear()
+        ns['__name__'] = name
+        self.require(requires)[0].run_script(script_name, ns)
+
+
+
+    def __iter__(self):
+        """Yield distributions for non-duplicate projects in the working set
+
+        The yield order is the order in which the items' path entries were
+        added to the working set.
+        """
+        seen = {}
+        for item in self.entries:
+            for key in self.entry_keys[item]:
+                if key not in seen:
+                    seen[key]=1
+                    yield self.by_key[key]
+
+    def add(self, dist, entry=None, insert=True):
+        """Add `dist` to working set, associated with `entry`
+
+        If `entry` is unspecified, it defaults to the ``.location`` of `dist`.
+        On exit from this routine, `entry` is added to the end of the working
+        set's ``.entries`` (if it wasn't already present).
+
+        `dist` is only added to the working set if it's for a project that
+        doesn't already have a distribution in the set.  If it's added, any
+        callbacks registered with the ``subscribe()`` method will be called.
+        """
+        if insert:
+            dist.insert_on(self.entries, entry)
+
+        if entry is None:
+            entry = dist.location
+        keys = self.entry_keys.setdefault(entry,[])
+        keys2 = self.entry_keys.setdefault(dist.location,[])
+        if dist.key in self.by_key:
+            return      # ignore hidden distros
+
+        self.by_key[dist.key] = dist
+        if dist.key not in keys:
+            keys.append(dist.key)
+        if dist.key not in keys2:
+            keys2.append(dist.key)
+        self._added_new(dist)
+
+    def resolve(self, requirements, env=None, installer=None):
+        """List all distributions needed to (recursively) meet `requirements`
+
+        `requirements` must be a sequence of ``Requirement`` objects.  `env`,
+        if supplied, should be an ``Environment`` instance.  If
+        not supplied, it defaults to all distributions available within any
+        entry or distribution in the working set.  `installer`, if supplied,
+        will be invoked with each requirement that cannot be met by an
+        already-installed distribution; it should return a ``Distribution`` or
+        ``None``.
+        """
+
+        requirements = list(requirements)[::-1]  # set up the stack
+        processed = {}  # set of processed requirements
+        best = {}  # key -> dist
+        to_activate = []
+
+        while requirements:
+            req = requirements.pop(0)   # process dependencies breadth-first
+            if req in processed:
+                # Ignore cyclic or redundant dependencies
+                continue
+            dist = best.get(req.key)
+            if dist is None:
+                # Find the best distribution and add it to the map
+                dist = self.by_key.get(req.key)
+                if dist is None:
+                    if env is None:
+                        env = Environment(self.entries)
+                    dist = best[req.key] = env.best_match(req, self, installer)
+                    if dist is None:
+                        raise DistributionNotFound(req)  # XXX put more info here
+                to_activate.append(dist)
+            if dist not in req:
+                # Oops, the "best" so far conflicts with a dependency
+                raise VersionConflict(dist,req) # XXX put more info here
+            requirements.extend(dist.requires(req.extras)[::-1])
+            processed[req] = True
+
+        return to_activate    # return list of distros to activate
+
+    def find_plugins(self,
+        plugin_env, full_env=None, installer=None, fallback=True
+    ):
+        """Find all activatable distributions in `plugin_env`
+
+        Example usage::
+
+            distributions, errors = working_set.find_plugins(
+                Environment(plugin_dirlist)
+            )
+            map(working_set.add, distributions)  # add plugins+libs to sys.path
+            print "Couldn't load", errors        # display errors
+
+        The `plugin_env` should be an ``Environment`` instance that contains
+        only distributions that are in the project's "plugin directory" or
+        directories. The `full_env`, if supplied, should be an ``Environment``
+        contains all currently-available distributions.  If `full_env` is not
+        supplied, one is created automatically from the ``WorkingSet`` this
+        method is called on, which will typically mean that every directory on
+        ``sys.path`` will be scanned for distributions.
+
+        `installer` is a standard installer callback as used by the
+        ``resolve()`` method. The `fallback` flag indicates whether we should
+        attempt to resolve older versions of a plugin if the newest version
+        cannot be resolved.
+
+        This method returns a 2-tuple: (`distributions`, `error_info`), where
+        `distributions` is a list of the distributions found in `plugin_env`
+        that were loadable, along with any other distributions that are needed
+        to resolve their dependencies.  `error_info` is a dictionary mapping
+        unloadable plugin distributions to an exception instance describing the
+        error that occurred. Usually this will be a ``DistributionNotFound`` or
+        ``VersionConflict`` instance.
+        """
+
+        plugin_projects = list(plugin_env)
+        plugin_projects.sort()  # scan project names in alphabetic order
+
+        error_info = {}
+        distributions = {}
+
+        if full_env is None:
+            env = Environment(self.entries)
+            env += plugin_env
+        else:
+            env = full_env + plugin_env
+
+        shadow_set = self.__class__([])
+        map(shadow_set.add, self)   # put all our entries in shadow_set
+
+        for project_name in plugin_projects:
+
+            for dist in plugin_env[project_name]:
+
+                req = [dist.as_requirement()]
+
+                try:
+                    resolvees = shadow_set.resolve(req, env, installer)
+
+                except ResolutionError,v:
+                    error_info[dist] = v    # save error info
+                    if fallback:
+                        continue    # try the next older version of project
+                    else:
+                        break       # give up on this project, keep going
+
+                else:
+                    map(shadow_set.add, resolvees)
+                    distributions.update(dict.fromkeys(resolvees))
+
+                    # success, no need to try any more versions of this project
+                    break
+
+        distributions = list(distributions)
+        distributions.sort()
+
+        return distributions, error_info
+
+
+
+
+
+    def require(self, *requirements):
+        """Ensure that distributions matching `requirements` are activated
+
+        `requirements` must be a string or a (possibly-nested) sequence
+        thereof, specifying the distributions and versions required.  The
+        return value is a sequence of the distributions that needed to be
+        activated to fulfill the requirements; all relevant distributions are
+        included, even if they were already activated in this working set.
+        """
+        needed = self.resolve(parse_requirements(requirements))
+
+        for dist in needed:
+            self.add(dist)
+
+        return needed
+
+    def subscribe(self, callback):
+        """Invoke `callback` for all distributions (including existing ones)"""
+        if callback in self.callbacks:
+            return
+        self.callbacks.append(callback)
+        for dist in self:
+            callback(dist)
+
+    def _added_new(self, dist):
+        for callback in self.callbacks:
+            callback(dist)
+
+    def __getstate__(self):
+        return (
+            self.entries[:], self.entry_keys.copy(), self.by_key.copy(),
+            self.callbacks[:]
+        )
+
+    def __setstate__(self, (entries, keys, by_key, callbacks)):
+        self.entries = entries[:]
+        self.entry_keys = keys.copy()
+        self.by_key = by_key.copy()
+        self.callbacks = callbacks[:]
+
+
+class Environment(object):
+    """Searchable snapshot of distributions on a search path"""
+
+    def __init__(self, search_path=None, platform=get_supported_platform(), python=PY_MAJOR):
+        """Snapshot distributions available on a search path
+
+        Any distributions found on `search_path` are added to the environment.
+        `search_path` should be a sequence of ``sys.path`` items.  If not
+        supplied, ``sys.path`` is used.
+
+        `platform` is an optional string specifying the name of the platform
+        that platform-specific distributions must be compatible with.  If
+        unspecified, it defaults to the current platform.  `python` is an
+        optional string naming the desired version of Python (e.g. ``'2.4'``);
+        it defaults to the current version.
+
+        You may explicitly set `platform` (and/or `python`) to ``None`` if you
+        wish to map *all* distributions, not just those compatible with the
+        running platform or Python version.
+        """
+        self._distmap = {}
+        self._cache = {}
+        self.platform = platform
+        self.python = python
+        self.scan(search_path)
+
+    def can_add(self, dist):
+        """Is distribution `dist` acceptable for this environment?
+
+        The distribution must match the platform and python version
+        requirements specified when this environment was created, or False
+        is returned.
+        """
+        return (self.python is None or dist.py_version is None
+            or dist.py_version==self.python) \
+           and compatible_platforms(dist.platform,self.platform)
+
+    def remove(self, dist):
+        """Remove `dist` from the environment"""
+        self._distmap[dist.key].remove(dist)
+
+    def scan(self, search_path=None):
+        """Scan `search_path` for distributions usable in this environment
+
+        Any distributions found are added to the environment.
+        `search_path` should be a sequence of ``sys.path`` items.  If not
+        supplied, ``sys.path`` is used.  Only distributions conforming to
+        the platform/python version defined at initialization are added.
+        """
+        if search_path is None:
+            search_path = sys.path
+
+        for item in search_path:
+            for dist in find_distributions(item):
+                self.add(dist)
+
+    def __getitem__(self,project_name):
+        """Return a newest-to-oldest list of distributions for `project_name`
+        """
+        try:
+            return self._cache[project_name]
+        except KeyError:
+            project_name = project_name.lower()
+            if project_name not in self._distmap:
+                return []
+
+        if project_name not in self._cache:
+            dists = self._cache[project_name] = self._distmap[project_name]
+            _sort_dists(dists)
+
+        return self._cache[project_name]
+
+    def add(self,dist):
+        """Add `dist` if we ``can_add()`` it and it isn't already added"""
+        if self.can_add(dist) and dist.has_version():
+            dists = self._distmap.setdefault(dist.key,[])
+            if dist not in dists:
+                dists.append(dist)
+                if dist.key in self._cache:
+                    _sort_dists(self._cache[dist.key])
+
+
+    def best_match(self, req, working_set, installer=None):
+        """Find distribution best matching `req` and usable on `working_set`
+
+        This calls the ``find(req)`` method of the `working_set` to see if a
+        suitable distribution is already active.  (This may raise
+        ``VersionConflict`` if an unsuitable version of the project is already
+        active in the specified `working_set`.)  If a suitable distribution
+        isn't active, this method returns the newest distribution in the
+        environment that meets the ``Requirement`` in `req`.  If no suitable
+        distribution is found, and `installer` is supplied, then the result of
+        calling the environment's ``obtain(req, installer)`` method will be
+        returned.
+        """
+        dist = working_set.find(req)
+        if dist is not None:
+            return dist
+        for dist in self[req.key]:
+            if dist in req:
+                return dist
+        return self.obtain(req, installer) # try and download/install
+
+    def obtain(self, requirement, installer=None):
+        """Obtain a distribution matching `requirement` (e.g. via download)
+
+        Obtain a distro that matches requirement (e.g. via download).  In the
+        base ``Environment`` class, this routine just returns
+        ``installer(requirement)``, unless `installer` is None, in which case
+        None is returned instead.  This method is a hook that allows subclasses
+        to attempt other ways of obtaining a distribution before falling back
+        to the `installer` argument."""
+        if installer is not None:
+            return installer(requirement)
+
+    def __iter__(self):
+        """Yield the unique project names of the available distributions"""
+        for key in self._distmap.keys():
+            if self[key]: yield key
+
+
+
+
+    def __iadd__(self, other):
+        """In-place addition of a distribution or environment"""
+        if isinstance(other,Distribution):
+            self.add(other)
+        elif isinstance(other,Environment):
+            for project in other:
+                for dist in other[project]:
+                    self.add(dist)
+        else:
+            raise TypeError("Can't add %r to environment" % (other,))
+        return self
+
+    def __add__(self, other):
+        """Add an environment or distribution to an environment"""
+        new = self.__class__([], platform=None, python=None)
+        for env in self, other:
+            new += env
+        return new
+
+
+AvailableDistributions = Environment    # XXX backward compatibility
+
+
+class ExtractionError(RuntimeError):
+    """An error occurred extracting a resource
+
+    The following attributes are available from instances of this exception:
+
+    manager
+        The resource manager that raised this exception
+
+    cache_path
+        The base directory for resource extraction
+
+    original_error
+        The exception instance that caused extraction to fail
+    """
+
+
+
+
+class ResourceManager:
+    """Manage resource extraction and packages"""
+    extraction_path = None
+
+    def __init__(self):
+        self.cached_files = {}
+
+    def resource_exists(self, package_or_requirement, resource_name):
+        """Does the named resource exist?"""
+        return get_provider(package_or_requirement).has_resource(resource_name)
+
+    def resource_isdir(self, package_or_requirement, resource_name):
+        """Is the named resource an existing directory?"""
+        return get_provider(package_or_requirement).resource_isdir(
+            resource_name
+        )
+
+    def resource_filename(self, package_or_requirement, resource_name):
+        """Return a true filesystem path for specified resource"""
+        return get_provider(package_or_requirement).get_resource_filename(
+            self, resource_name
+        )
+
+    def resource_stream(self, package_or_requirement, resource_name):
+        """Return a readable file-like object for specified resource"""
+        return get_provider(package_or_requirement).get_resource_stream(
+            self, resource_name
+        )
+
+    def resource_string(self, package_or_requirement, resource_name):
+        """Return specified resource as a string"""
+        return get_provider(package_or_requirement).get_resource_string(
+            self, resource_name
+        )
+
+    def resource_listdir(self, package_or_requirement, resource_name):
+        """List the contents of the named resource directory"""
+        return get_provider(package_or_requirement).resource_listdir(
+            resource_name
+        )
+
+    def extraction_error(self):
+        """Give an error message for problems extracting file(s)"""
+
+        old_exc = sys.exc_info()[1]
+        cache_path = self.extraction_path or get_default_cache()
+
+        err = ExtractionError("""Can't extract file(s) to egg cache
+
+The following error occurred while trying to extract file(s) to the Python egg
+cache:
+
+  %s
+
+The Python egg cache directory is currently set to:
+
+  %s
+
+Perhaps your account does not have write access to this directory?  You can
+change the cache directory by setting the PYTHON_EGG_CACHE environment
+variable to point to an accessible directory.
+"""         % (old_exc, cache_path)
+        )
+        err.manager        = self
+        err.cache_path     = cache_path
+        err.original_error = old_exc
+        raise err
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+    def get_cache_path(self, archive_name, names=()):
+        """Return absolute location in cache for `archive_name` and `names`
+
+        The parent directory of the resulting path will be created if it does
+        not already exist.  `archive_name` should be the base filename of the
+        enclosing egg (which may not be the name of the enclosing zipfile!),
+        including its ".egg" extension.  `names`, if provided, should be a
+        sequence of path name parts "under" the egg's extraction location.
+
+        This method should only be called by resource providers that need to
+        obtain an extraction location, and only for names they intend to
+        extract, as it tracks the generated names for possible cleanup later.
+        """
+        extract_path = self.extraction_path or get_default_cache()
+        target_path = os.path.join(extract_path, archive_name+'-tmp', *names)
+        try:
+            _bypass_ensure_directory(target_path)
+        except:
+            self.extraction_error()
+
+        self.cached_files[target_path] = 1
+        return target_path
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+    def postprocess(self, tempname, filename):
+        """Perform any platform-specific postprocessing of `tempname`
+
+        This is where Mac header rewrites should be done; other platforms don't
+        have anything special they should do.
+
+        Resource providers should call this method ONLY after successfully
+        extracting a compressed resource.  They must NOT call it on resources
+        that are already in the filesystem.
+
+        `tempname` is the current (temporary) name of the file, and `filename`
+        is the name it will be renamed to by the caller after this routine
+        returns.
+        """
+
+        if os.name == 'posix':
+            # Make the resource executable
+            mode = ((os.stat(tempname).st_mode) | 0555) & 07777
+            os.chmod(tempname, mode)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+    def set_extraction_path(self, path):
+        """Set the base path where resources will be extracted to, if needed.
+
+        If you do not call this routine before any extractions take place, the
+        path defaults to the return value of ``get_default_cache()``.  (Which
+        is based on the ``PYTHON_EGG_CACHE`` environment variable, with various
+        platform-specific fallbacks.  See that routine's documentation for more
+        details.)
+
+        Resources are extracted to subdirectories of this path based upon
+        information given by the ``IResourceProvider``.  You may set this to a
+        temporary directory, but then you must call ``cleanup_resources()`` to
+        delete the extracted files when done.  There is no guarantee that
+        ``cleanup_resources()`` will be able to remove all extracted files.
+
+        (Note: you may not change the extraction path for a given resource
+        manager once resources have been extracted, unless you first call
+        ``cleanup_resources()``.)
+        """
+        if self.cached_files:
+            raise ValueError(
+                "Can't change extraction path, files already extracted"
+            )
+
+        self.extraction_path = path
+
+    def cleanup_resources(self, force=False):
+        """
+        Delete all extracted resource files and directories, returning a list
+        of the file and directory names that could not be successfully removed.
+        This function does not have any concurrency protection, so it should
+        generally only be called when the extraction path is a temporary
+        directory exclusive to a single process.  This method is not
+        automatically called; you must call it explicitly or register it as an
+        ``atexit`` function if you wish to ensure cleanup of a temporary
+        directory used for extractions.
+        """
+        # XXX
+
+
+
+def get_default_cache():
+    """Determine the default cache location
+
+    This returns the ``PYTHON_EGG_CACHE`` environment variable, if set.
+    Otherwise, on Windows, it returns a "Python-Eggs" subdirectory of the
+    "Application Data" directory.  On all other systems, it's "~/.python-eggs".
+    """
+    try:
+        return os.environ['PYTHON_EGG_CACHE']
+    except KeyError:
+        pass
+
+    if os.name!='nt':
+        return os.path.expanduser('~/.python-eggs')
+
+    app_data = 'Application Data'   # XXX this may be locale-specific!
+    app_homes = [
+        (('APPDATA',), None),       # best option, should be locale-safe
+        (('USERPROFILE',), app_data),
+        (('HOMEDRIVE','HOMEPATH'), app_data),
+        (('HOMEPATH',), app_data),
+        (('HOME',), None),
+        (('WINDIR',), app_data),    # 95/98/ME
+    ]
+
+    for keys, subdir in app_homes:
+        dirname = ''
+        for key in keys:
+            if key in os.environ:
+                dirname = os.path.join(dirname, os.environ[key])
+            else:
+                break
+        else:
+            if subdir:
+                dirname = os.path.join(dirname,subdir)
+            return os.path.join(dirname, 'Python-Eggs')
+    else:
+        raise RuntimeError(
+            "Please set the PYTHON_EGG_CACHE enviroment variable"
+        )
+
+def safe_name(name):
+    """Convert an arbitrary string to a standard distribution name
+
+    Any runs of non-alphanumeric/. characters are replaced with a single '-'.
+    """
+    return re.sub('[^A-Za-z0-9.]+', '-', name)
+
+
+def safe_version(version):
+    """Convert an arbitrary string to a standard version string
+
+    Spaces become dots, and all other non-alphanumeric characters become
+    dashes, with runs of multiple dashes condensed to a single dash.
+    """
+    version = version.replace(' ','.')
+    return re.sub('[^A-Za-z0-9.]+', '-', version)
+
+
+def safe_extra(extra):
+    """Convert an arbitrary string to a standard 'extra' name
+
+    Any runs of non-alphanumeric characters are replaced with a single '_',
+    and the result is always lowercased.
+    """
+    return re.sub('[^A-Za-z0-9.]+', '_', extra).lower()
+
+
+def to_filename(name):
+    """Convert a project or version name to its filename-escaped form
+
+    Any '-' characters are currently replaced with '_'.
+    """
+    return name.replace('-','_')
+
+
+
+
+
+
+
+
+class NullProvider:
+    """Try to implement resources and metadata for arbitrary PEP 302 loaders"""
+
+    egg_name = None
+    egg_info = None
+    loader = None
+
+    def __init__(self, module):
+        self.loader = getattr(module, '__loader__', None)
+        self.module_path = os.path.dirname(getattr(module, '__file__', ''))
+
+    def get_resource_filename(self, manager, resource_name):
+        return self._fn(self.module_path, resource_name)
+
+    def get_resource_stream(self, manager, resource_name):
+        return StringIO(self.get_resource_string(manager, resource_name))
+
+    def get_resource_string(self, manager, resource_name):
+        return self._get(self._fn(self.module_path, resource_name))
+
+    def has_resource(self, resource_name):
+        return self._has(self._fn(self.module_path, resource_name))
+
+    def has_metadata(self, name):
+        return self.egg_info and self._has(self._fn(self.egg_info,name))
+
+    def get_metadata(self, name):
+        if not self.egg_info:
+            return ""
+        return self._get(self._fn(self.egg_info,name))
+
+    def get_metadata_lines(self, name):
+        return yield_lines(self.get_metadata(name))
+
+    def resource_isdir(self,resource_name):
+        return self._isdir(self._fn(self.module_path, resource_name))
+
+    def metadata_isdir(self,name):
+        return self.egg_info and self._isdir(self._fn(self.egg_info,name))
+
+
+    def resource_listdir(self,resource_name):
+        return self._listdir(self._fn(self.module_path,resource_name))
+
+    def metadata_listdir(self,name):
+        if self.egg_info:
+            return self._listdir(self._fn(self.egg_info,name))
+        return []
+
+    def run_script(self,script_name,namespace):
+        script = 'scripts/'+script_name
+        if not self.has_metadata(script):
+            raise ResolutionError("No script named %r" % script_name)
+        script_text = self.get_metadata(script).replace('\r\n','\n')
+        script_text = script_text.replace('\r','\n')
+        script_filename = self._fn(self.egg_info,script)
+        namespace['__file__'] = script_filename
+        if os.path.exists(script_filename):
+            execfile(script_filename, namespace, namespace)
+        else:
+            from linecache import cache
+            cache[script_filename] = (
+                len(script_text), 0, script_text.split('\n'), script_filename
+            )
+            script_code = compile(script_text,script_filename,'exec')
+            exec script_code in namespace, namespace
+
+    def _has(self, path):
+        raise NotImplementedError(
+            "Can't perform this operation for unregistered loader type"
+        )
+
+    def _isdir(self, path):
+        raise NotImplementedError(
+            "Can't perform this operation for unregistered loader type"
+        )
+
+    def _listdir(self, path):
+        raise NotImplementedError(
+            "Can't perform this operation for unregistered loader type"
+        )
+
+    def _fn(self, base, resource_name):
+        if resource_name:
+            return os.path.join(base, *resource_name.split('/'))
+        return base
+
+    def _get(self, path):
+        if hasattr(self.loader, 'get_data'):
+            return self.loader.get_data(path)
+        raise NotImplementedError(
+            "Can't perform this operation for loaders without 'get_data()'"
+        )
+
+register_loader_type(object, NullProvider)
+
+
+class EggProvider(NullProvider):
+    """Provider based on a virtual filesystem"""
+
+    def __init__(self,module):
+        NullProvider.__init__(self,module)
+        self._setup_prefix()
+
+    def _setup_prefix(self):
+        # we assume here that our metadata may be nested inside a "basket"
+        # of multiple eggs; that's why we use module_path instead of .archive
+        path = self.module_path
+        old = None
+        while path!=old:
+            if path.lower().endswith('.egg'):
+                self.egg_name = os.path.basename(path)
+                self.egg_info = os.path.join(path, 'EGG-INFO')
+                self.egg_root = path
+                break
+            old = path
+            path, base = os.path.split(path)
+
+
+
+
+
+
+class DefaultProvider(EggProvider):
+    """Provides access to package resources in the filesystem"""
+
+    def _has(self, path):
+        return os.path.exists(path)
+
+    def _isdir(self,path):
+        return os.path.isdir(path)
+
+    def _listdir(self,path):
+        return os.listdir(path)
+
+    def get_resource_stream(self, manager, resource_name):
+        return open(self._fn(self.module_path, resource_name), 'rb')
+
+    def _get(self, path):
+        stream = open(path, 'rb')
+        try:
+            return stream.read()
+        finally:
+            stream.close()
+
+register_loader_type(type(None), DefaultProvider)
+
+
+class EmptyProvider(NullProvider):
+    """Provider that returns nothing for all requests"""
+
+    _isdir = _has = lambda self,path: False
+    _get          = lambda self,path: ''
+    _listdir      = lambda self,path: []
+    module_path   = None
+
+    def __init__(self):
+        pass
+
+empty_provider = EmptyProvider()
+
+
+
+
+class ZipProvider(EggProvider):
+    """Resource support for zips and eggs"""
+
+    eagers = None
+
+    def __init__(self, module):
+        EggProvider.__init__(self,module)
+        self.zipinfo = zipimport._zip_directory_cache[self.loader.archive]
+        self.zip_pre = self.loader.archive+os.sep
+
+    def _zipinfo_name(self, fspath):
+        # Convert a virtual filename (full path to file) into a zipfile subpath
+        # usable with the zipimport directory cache for our target archive
+        if fspath.startswith(self.zip_pre):
+            return fspath[len(self.zip_pre):]
+        raise AssertionError(
+            "%s is not a subpath of %s" % (fspath,self.zip_pre)
+        )
+
+    def _parts(self,zip_path):
+        # Convert a zipfile subpath into an egg-relative path part list
+        fspath = self.zip_pre+zip_path  # pseudo-fs path
+        if fspath.startswith(self.egg_root+os.sep):
+            return fspath[len(self.egg_root)+1:].split(os.sep)
+        raise AssertionError(
+            "%s is not a subpath of %s" % (fspath,self.egg_root)
+        )
+
+    def get_resource_filename(self, manager, resource_name):
+        if not self.egg_name:
+            raise NotImplementedError(
+                "resource_filename() only supported for .egg, not .zip"
+            )
+        # no need to lock for extraction, since we use temp names
+        zip_path = self._resource_to_zip(resource_name)
+        eagers = self._get_eager_resources()
+        if '/'.join(self._parts(zip_path)) in eagers:
+            for name in eagers:
+                self._extract_resource(manager, self._eager_to_zip(name))
+        return self._extract_resource(manager, zip_path)
+
+    def _extract_resource(self, manager, zip_path):
+
+        if zip_path in self._index():
+            for name in self._index()[zip_path]:
+                last = self._extract_resource(
+                    manager, os.path.join(zip_path, name)
+                )
+            return os.path.dirname(last)  # return the extracted directory name
+
+        zip_stat = self.zipinfo[zip_path]
+        t,d,size = zip_stat[5], zip_stat[6], zip_stat[3]
+        date_time = (
+            (d>>9)+1980, (d>>5)&0xF, d&0x1F,                      # ymd
+            (t&0xFFFF)>>11, (t>>5)&0x3F, (t&0x1F) * 2, 0, 0, -1   # hms, etc.
+        )
+        timestamp = time.mktime(date_time)
+
+        try:
+            real_path = manager.get_cache_path(
+                self.egg_name, self._parts(zip_path)
+            )
+
+            if os.path.isfile(real_path):
+                stat = os.stat(real_path)
+                if stat.st_size==size and stat.st_mtime==timestamp:
+                    # size and stamp match, don't bother extracting
+                    return real_path
+
+            outf, tmpnam = _mkstemp(".$extract", dir=os.path.dirname(real_path))
+            os.write(outf, self.loader.get_data(zip_path))
+            os.close(outf)
+            utime(tmpnam, (timestamp,timestamp))
+            manager.postprocess(tmpnam, real_path)
+
+            try:
+                rename(tmpnam, real_path)
+
+            except os.error:
+                if os.path.isfile(real_path):
+                    stat = os.stat(real_path)
+
+                    if stat.st_size==size and stat.st_mtime==timestamp:
+                        # size and stamp match, somebody did it just ahead of
+                        # us, so we're done
+                        return real_path
+                    elif os.name=='nt':     # Windows, del old file and retry
+                        unlink(real_path)
+                        rename(tmpnam, real_path)
+                        return real_path
+                raise
+
+        except os.error:
+            manager.extraction_error()  # report a user-friendly error
+
+        return real_path
+
+    def _get_eager_resources(self):
+        if self.eagers is None:
+            eagers = []
+            for name in ('native_libs.txt', 'eager_resources.txt'):
+                if self.has_metadata(name):
+                    eagers.extend(self.get_metadata_lines(name))
+            self.eagers = eagers
+        return self.eagers
+
+    def _index(self):
+        try:
+            return self._dirindex
+        except AttributeError:
+            ind = {}
+            for path in self.zipinfo:
+                parts = path.split(os.sep)
+                while parts:
+                    parent = os.sep.join(parts[:-1])
+                    if parent in ind:
+                        ind[parent].append(parts[-1])
+                        break
+                    else:
+                        ind[parent] = [parts.pop()]
+            self._dirindex = ind
+            return ind
+
+    def _has(self, fspath):
+        zip_path = self._zipinfo_name(fspath)
+        return zip_path in self.zipinfo or zip_path in self._index()
+
+    def _isdir(self,fspath):
+        return self._zipinfo_name(fspath) in self._index()
+
+    def _listdir(self,fspath):
+        return list(self._index().get(self._zipinfo_name(fspath), ()))
+
+    def _eager_to_zip(self,resource_name):
+        return self._zipinfo_name(self._fn(self.egg_root,resource_name))
+
+    def _resource_to_zip(self,resource_name):
+        return self._zipinfo_name(self._fn(self.module_path,resource_name))
+
+register_loader_type(zipimport.zipimporter, ZipProvider)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class FileMetadata(EmptyProvider):
+    """Metadata handler for standalone PKG-INFO files
+
+    Usage::
+
+        metadata = FileMetadata("/path/to/PKG-INFO")
+
+    This provider rejects all data and metadata requests except for PKG-INFO,
+    which is treated as existing, and will be the contents of the file at
+    the provided location.
+    """
+
+    def __init__(self,path):
+        self.path = path
+
+    def has_metadata(self,name):
+        return name=='PKG-INFO'
+
+    def get_metadata(self,name):
+        if name=='PKG-INFO':
+            return open(self.path,'rU').read()
+        raise KeyError("No metadata except PKG-INFO is available")
+
+    def get_metadata_lines(self,name):
+        return yield_lines(self.get_metadata(name))
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class PathMetadata(DefaultProvider):
+    """Metadata provider for egg directories
+
+    Usage::
+
+        # Development eggs:
+
+        egg_info = "/path/to/PackageName.egg-info"
+        base_dir = os.path.dirname(egg_info)
+        metadata = PathMetadata(base_dir, egg_info)
+        dist_name = os.path.splitext(os.path.basename(egg_info))[0]
+        dist = Distribution(basedir,project_name=dist_name,metadata=metadata)
+
+        # Unpacked egg directories:
+
+        egg_path = "/path/to/PackageName-ver-pyver-etc.egg"
+        metadata = PathMetadata(egg_path, os.path.join(egg_path,'EGG-INFO'))
+        dist = Distribution.from_filename(egg_path, metadata=metadata)
+    """
+
+    def __init__(self, path, egg_info):
+        self.module_path = path
+        self.egg_info = egg_info
+
+
+class EggMetadata(ZipProvider):
+    """Metadata provider for .egg files"""
+
+    def __init__(self, importer):
+        """Create a metadata provider from a zipimporter"""
+
+        self.zipinfo = zipimport._zip_directory_cache[importer.archive]
+        self.zip_pre = importer.archive+os.sep
+        self.loader = importer
+        if importer.prefix:
+            self.module_path = os.path.join(importer.archive, importer.prefix)
+        else:
+            self.module_path = importer.archive
+        self._setup_prefix()
+
+
+class ImpWrapper:
+    """PEP 302 Importer that wraps Python's "normal" import algorithm"""
+
+    def __init__(self, path=None):
+        self.path = path
+
+    def find_module(self, fullname, path=None):
+        subname = fullname.split(".")[-1]
+        if subname != fullname and self.path is None:
+            return None
+        if self.path is None:
+            path = None
+        else:
+            path = [self.path]
+        try:
+            file, filename, etc = imp.find_module(subname, path)
+        except ImportError:
+            return None
+        return ImpLoader(file, filename, etc)
+
+
+class ImpLoader:
+    """PEP 302 Loader that wraps Python's "normal" import algorithm"""
+
+    def __init__(self, file, filename, etc):
+        self.file = file
+        self.filename = filename
+        self.etc = etc
+
+    def load_module(self, fullname):
+        try:
+            mod = imp.load_module(fullname, self.file, self.filename, self.etc)
+        finally:
+            if self.file: self.file.close()
+        # Note: we don't set __loader__ because we want the module to look
+        # normal; i.e. this is just a wrapper for standard import machinery
+        return mod
+
+
+
+
+def get_importer(path_item):
+    """Retrieve a PEP 302 "importer" for the given path item
+
+    If there is no importer, this returns a wrapper around the builtin import
+    machinery.  The returned importer is only cached if it was created by a
+    path hook.
+    """
+    try:
+        importer = sys.path_importer_cache[path_item]
+    except KeyError:
+        for hook in sys.path_hooks:
+            try:
+                importer = hook(path_item)
+            except ImportError:
+                pass
+            else:
+                break
+        else:
+            importer = None
+
+    sys.path_importer_cache.setdefault(path_item,importer)
+    if importer is None:
+        try:
+            importer = ImpWrapper(path_item)
+        except ImportError:
+            pass
+    return importer
+
+try:
+    from pkgutil import get_importer, ImpImporter
+except ImportError:
+    pass    # Python 2.3 or 2.4, use our own implementation
+else:
+    ImpWrapper = ImpImporter    # Python 2.5, use pkgutil's implementation
+    del ImpLoader, ImpImporter
+
+
+
+
+
+
+_declare_state('dict', _distribution_finders = {})
+
+def register_finder(importer_type, distribution_finder):
+    """Register `distribution_finder` to find distributions in sys.path items
+
+    `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item
+    handler), and `distribution_finder` is a callable that, passed a path
+    item and the importer instance, yields ``Distribution`` instances found on
+    that path item.  See ``pkg_resources.find_on_path`` for an example."""
+    _distribution_finders[importer_type] = distribution_finder
+
+
+def find_distributions(path_item, only=False):
+    """Yield distributions accessible via `path_item`"""
+    importer = get_importer(path_item)
+    finder = _find_adapter(_distribution_finders, importer)
+    return finder(importer, path_item, only)
+
+def find_in_zip(importer, path_item, only=False):
+    metadata = EggMetadata(importer)
+    if metadata.has_metadata('PKG-INFO'):
+        yield Distribution.from_filename(path_item, metadata=metadata)
+    if only:
+        return  # don't yield nested distros
+    for subitem in metadata.resource_listdir('/'):
+        if subitem.endswith('.egg'):
+            subpath = os.path.join(path_item, subitem)
+            for dist in find_in_zip(zipimport.zipimporter(subpath), subpath):
+                yield dist
+
+register_finder(zipimport.zipimporter, find_in_zip)
+
+def StringIO(*args, **kw):
+    """Thunk to load the real StringIO on demand"""
+    global StringIO
+    try:
+        from cStringIO import StringIO
+    except ImportError:
+        from StringIO import StringIO
+    return StringIO(*args,**kw)
+
+def find_nothing(importer, path_item, only=False):
+    return ()
+register_finder(object,find_nothing)
+
+def find_on_path(importer, path_item, only=False):
+    """Yield distributions accessible on a sys.path directory"""
+    path_item = _normalize_cached(path_item)
+
+    if os.path.isdir(path_item) and os.access(path_item, os.R_OK):
+        if path_item.lower().endswith('.egg'):
+            # unpacked egg
+            yield Distribution.from_filename(
+                path_item, metadata=PathMetadata(
+                    path_item, os.path.join(path_item,'EGG-INFO')
+                )
+            )
+        else:
+            # scan for .egg and .egg-info in directory
+            for entry in os.listdir(path_item):
+                lower = entry.lower()
+                if lower.endswith('.egg-info'):
+                    fullpath = os.path.join(path_item, entry)
+                    if os.path.isdir(fullpath):
+                        # egg-info directory, allow getting metadata
+                        metadata = PathMetadata(path_item, fullpath)
+                    else:
+                        metadata = FileMetadata(fullpath)
+                    yield Distribution.from_location(
+                        path_item,entry,metadata,precedence=DEVELOP_DIST
+                    )
+                elif not only and lower.endswith('.egg'):
+                    for dist in find_distributions(os.path.join(path_item, entry)):
+                        yield dist
+                elif not only and lower.endswith('.egg-link'):
+                    for line in file(os.path.join(path_item, entry)):
+                        if not line.strip(): continue
+                        for item in find_distributions(os.path.join(path_item,line.rstrip())):
+                            yield item
+                        break
+register_finder(ImpWrapper,find_on_path)
+
+_declare_state('dict', _namespace_handlers = {})
+_declare_state('dict', _namespace_packages = {})
+
+def register_namespace_handler(importer_type, namespace_handler):
+    """Register `namespace_handler` to declare namespace packages
+
+    `importer_type` is the type or class of a PEP 302 "Importer" (sys.path item
+    handler), and `namespace_handler` is a callable like this::
+
+        def namespace_handler(importer,path_entry,moduleName,module):
+            # return a path_entry to use for child packages
+
+    Namespace handlers are only called if the importer object has already
+    agreed that it can handle the relevant path item, and they should only
+    return a subpath if the module __path__ does not already contain an
+    equivalent subpath.  For an example namespace handler, see
+    ``pkg_resources.file_ns_handler``.
+    """
+    _namespace_handlers[importer_type] = namespace_handler
+
+def _handle_ns(packageName, path_item):
+    """Ensure that named package includes a subpath of path_item (if needed)"""
+    importer = get_importer(path_item)
+    if importer is None:
+        return None
+    loader = importer.find_module(packageName)
+    if loader is None:
+        return None
+    module = sys.modules.get(packageName)
+    if module is None:
+        module = sys.modules[packageName] = imp.new_module(packageName)
+        module.__path__ = []; _set_parent_ns(packageName)
+    elif not hasattr(module,'__path__'):
+        raise TypeError("Not a package:", packageName)
+    handler = _find_adapter(_namespace_handlers, importer)
+    subpath = handler(importer,path_item,packageName,module)
+    if subpath is not None:
+        path = module.__path__; path.append(subpath)
+        loader.load_module(packageName); module.__path__ = path
+    return subpath
+
+def declare_namespace(packageName):
+    """Declare that package 'packageName' is a namespace package"""
+
+    imp.acquire_lock()
+    try:
+        if packageName in _namespace_packages:
+            return
+
+        path, parent = sys.path, None
+        if '.' in packageName:
+            parent = '.'.join(packageName.split('.')[:-1])
+            declare_namespace(parent)
+            __import__(parent)
+            try:
+                path = sys.modules[parent].__path__
+            except AttributeError:
+                raise TypeError("Not a package:", parent)
+
+        # Track what packages are namespaces, so when new path items are added,
+        # they can be updated
+        _namespace_packages.setdefault(parent,[]).append(packageName)
+        _namespace_packages.setdefault(packageName,[])
+
+        for path_item in path:
+            # Ensure all the parent's path items are reflected in the child,
+            # if they apply
+            _handle_ns(packageName, path_item)
+
+    finally:
+        imp.release_lock()
+
+def fixup_namespace_packages(path_item, parent=None):
+    """Ensure that previously-declared namespace packages include path_item"""
+    imp.acquire_lock()
+    try:
+        for package in _namespace_packages.get(parent,()):
+            subpath = _handle_ns(package, path_item)
+            if subpath: fixup_namespace_packages(subpath,package)
+    finally:
+        imp.release_lock()
+
+def file_ns_handler(importer, path_item, packageName, module):
+    """Compute an ns-package subpath for a filesystem or zipfile importer"""
+
+    subpath = os.path.join(path_item, packageName.split('.')[-1])
+    normalized = _normalize_cached(subpath)
+    for item in module.__path__:
+        if _normalize_cached(item)==normalized:
+            break
+    else:
+        # Only return the path if it's not already there
+        return subpath
+
+register_namespace_handler(ImpWrapper,file_ns_handler)
+register_namespace_handler(zipimport.zipimporter,file_ns_handler)
+
+
+def null_ns_handler(importer, path_item, packageName, module):
+    return None
+
+register_namespace_handler(object,null_ns_handler)
+
+
+def normalize_path(filename):
+    """Normalize a file/dir name for comparison purposes"""
+    return os.path.normcase(os.path.realpath(filename))
+
+def _normalize_cached(filename,_cache={}):
+    try:
+        return _cache[filename]
+    except KeyError:
+        _cache[filename] = result = normalize_path(filename)
+        return result
+
+def _set_parent_ns(packageName):
+    parts = packageName.split('.')
+    name = parts.pop()
+    if parts:
+        parent = '.'.join(parts)
+        setattr(sys.modules[parent], name, sys.modules[packageName])
+
+
+def yield_lines(strs):
+    """Yield non-empty/non-comment lines of a ``basestring`` or sequence"""
+    if isinstance(strs,basestring):
+        for s in strs.splitlines():
+            s = s.strip()
+            if s and not s.startswith('#'):     # skip blank lines/comments
+                yield s
+    else:
+        for ss in strs:
+            for s in yield_lines(ss):
+                yield s
+
+LINE_END = re.compile(r"\s*(#.*)?$").match         # whitespace and comment
+CONTINUE = re.compile(r"\s*\\\s*(#.*)?$").match    # line continuation
+DISTRO   = re.compile(r"\s*((\w|[-.])+)").match    # Distribution or extra
+VERSION  = re.compile(r"\s*(<=?|>=?|==|!=)\s*((\w|[-.])+)").match  # ver. info
+COMMA    = re.compile(r"\s*,").match               # comma between items
+OBRACKET = re.compile(r"\s*\[").match
+CBRACKET = re.compile(r"\s*\]").match
+MODULE   = re.compile(r"\w+(\.\w+)*$").match
+EGG_NAME = re.compile(
+    r"(?P<name>[^-]+)"
+    r"( -(?P<ver>[^-]+) (-py(?P<pyver>[^-]+) (-(?P<plat>.+))? )? )?",
+    re.VERBOSE | re.IGNORECASE
+).match
+
+component_re = re.compile(r'(\d+ | [a-z]+ | \.| -)', re.VERBOSE)
+replace = {'pre':'c', 'preview':'c','-':'final-','rc':'c','dev':'@'}.get
+
+def _parse_version_parts(s):
+    for part in component_re.split(s):
+        part = replace(part,part)
+        if not part or part=='.':
+            continue
+        if part[:1] in '0123456789':
+            yield part.zfill(8)    # pad for numeric comparison
+        else:
+            yield '*'+part
+
+    yield '*final'  # ensure that alpha/beta/candidate are before final
+
+def parse_version(s):
+    """Convert a version string to a chronologically-sortable key
+
+    This is a rough cross between distutils' StrictVersion and LooseVersion;
+    if you give it versions that would work with StrictVersion, then it behaves
+    the same; otherwise it acts like a slightly-smarter LooseVersion. It is
+    *possible* to create pathological version coding schemes that will fool
+    this parser, but they should be very rare in practice.
+
+    The returned value will be a tuple of strings.  Numeric portions of the
+    version are padded to 8 digits so they will compare numerically, but
+    without relying on how numbers compare relative to strings.  Dots are
+    dropped, but dashes are retained.  Trailing zeros between alpha segments
+    or dashes are suppressed, so that e.g. "2.4.0" is considered the same as
+    "2.4". Alphanumeric parts are lower-cased.
+
+    The algorithm assumes that strings like "-" and any alpha string that
+    alphabetically follows "final"  represents a "patch level".  So, "2.4-1"
+    is assumed to be a branch or patch of "2.4", and therefore "2.4.1" is
+    considered newer than "2.4-1", which in turn is newer than "2.4".
+
+    Strings like "a", "b", "c", "alpha", "beta", "candidate" and so on (that
+    come before "final" alphabetically) are assumed to be pre-release versions,
+    so that the version "2.4" is considered newer than "2.4a1".
+
+    Finally, to handle miscellaneous cases, the strings "pre", "preview", and
+    "rc" are treated as if they were "c", i.e. as though they were release
+    candidates, and therefore are not as new as a version string that does not
+    contain them, and "dev" is replaced with an '@' so that it sorts lower than
+    than any other pre-release tag.
+    """
+    parts = []
+    for part in _parse_version_parts(s.lower()):
+        if part.startswith('*'):
+            if part<'*final':   # remove '-' before a prerelease tag
+                while parts and parts[-1]=='*final-': parts.pop()
+            # remove trailing zeros from each series of numeric parts
+            while parts and parts[-1]=='00000000':
+                parts.pop()
+        parts.append(part)
+    return tuple(parts)
+
+class EntryPoint(object):
+    """Object representing an advertised importable object"""
+
+    def __init__(self, name, module_name, attrs=(), extras=(), dist=None):
+        if not MODULE(module_name):
+            raise ValueError("Invalid module name", module_name)
+        self.name = name
+        self.module_name = module_name
+        self.attrs = tuple(attrs)
+        self.extras = Requirement.parse(("x[%s]" % ','.join(extras))).extras
+        self.dist = dist
+
+    def __str__(self):
+        s = "%s = %s" % (self.name, self.module_name)
+        if self.attrs:
+            s += ':' + '.'.join(self.attrs)
+        if self.extras:
+            s += ' [%s]' % ','.join(self.extras)
+        return s
+
+    def __repr__(self):
+        return "EntryPoint.parse(%r)" % str(self)
+
+    def load(self, require=True, env=None, installer=None):
+        if require: self.require(env, installer)
+        entry = __import__(self.module_name, globals(),globals(), ['__name__'])
+        for attr in self.attrs:
+            try:
+                entry = getattr(entry,attr)
+            except AttributeError:
+                raise ImportError("%r has no %r attribute" % (entry,attr))
+        return entry
+
+    def require(self, env=None, installer=None):
+        if self.extras and not self.dist:
+            raise UnknownExtra("Can't require() without a distribution", self)
+        map(working_set.add,
+            working_set.resolve(self.dist.requires(self.extras),env,installer))
+
+
+
+    #@classmethod
+    def parse(cls, src, dist=None):
+        """Parse a single entry point from string `src`
+
+        Entry point syntax follows the form::
+
+            name = some.module:some.attr [extra1,extra2]
+
+        The entry name and module name are required, but the ``:attrs`` and
+        ``[extras]`` parts are optional
+        """
+        try:
+            attrs = extras = ()
+            name,value = src.split('=',1)
+            if '[' in value:
+                value,extras = value.split('[',1)
+                req = Requirement.parse("x["+extras)
+                if req.specs: raise ValueError
+                extras = req.extras
+            if ':' in value:
+                value,attrs = value.split(':',1)
+                if not MODULE(attrs.rstrip()):
+                    raise ValueError
+                attrs = attrs.rstrip().split('.')
+        except ValueError:
+            raise ValueError(
+                "EntryPoint must be in 'name=module:attrs [extras]' format",
+                src
+            )
+        else:
+            return cls(name.strip(), value.strip(), attrs, extras, dist)
+
+    parse = classmethod(parse)
+
+
+
+
+
+
+
+
+    #@classmethod
+    def parse_group(cls, group, lines, dist=None):
+        """Parse an entry point group"""
+        if not MODULE(group):
+            raise ValueError("Invalid group name", group)
+        this = {}
+        for line in yield_lines(lines):
+            ep = cls.parse(line, dist)
+            if ep.name in this:
+                raise ValueError("Duplicate entry point", group, ep.name)
+            this[ep.name]=ep
+        return this
+
+    parse_group = classmethod(parse_group)
+
+    #@classmethod
+    def parse_map(cls, data, dist=None):
+        """Parse a map of entry point groups"""
+        if isinstance(data,dict):
+            data = data.items()
+        else:
+            data = split_sections(data)
+        maps = {}
+        for group, lines in data:
+            if group is None:
+                if not lines:
+                    continue
+                raise ValueError("Entry points must be listed in groups")
+            group = group.strip()
+            if group in maps:
+                raise ValueError("Duplicate group name", group)
+            maps[group] = cls.parse_group(group, lines, dist)
+        return maps
+
+    parse_map = classmethod(parse_map)
+
+
+
+
+
+
+class Distribution(object):
+    """Wrap an actual or potential sys.path entry w/metadata"""
+    def __init__(self,
+        location=None, metadata=None, project_name=None, version=None,
+        py_version=PY_MAJOR, platform=None, precedence = EGG_DIST
+    ):
+        self.project_name = safe_name(project_name or 'Unknown')
+        if version is not None:
+            self._version = safe_version(version)
+        self.py_version = py_version
+        self.platform = platform
+        self.location = location
+        self.precedence = precedence
+        self._provider = metadata or empty_provider
+
+    #@classmethod
+    def from_location(cls,location,basename,metadata=None,**kw):
+        project_name, version, py_version, platform = [None]*4
+        basename, ext = os.path.splitext(basename)
+        if ext.lower() in (".egg",".egg-info"):
+            match = EGG_NAME(basename)
+            if match:
+                project_name, version, py_version, platform = match.group(
+                    'name','ver','pyver','plat'
+                )
+        return cls(
+            location, metadata, project_name=project_name, version=version,
+            py_version=py_version, platform=platform, **kw
+        )
+    from_location = classmethod(from_location)
+
+    hashcmp = property(
+        lambda self: (
+            getattr(self,'parsed_version',()), self.precedence, self.key,
+            -len(self.location or ''), self.location, self.py_version,
+            self.platform
+        )
+    )
+    def __cmp__(self, other): return cmp(self.hashcmp, other)
+    def __hash__(self): return hash(self.hashcmp)
+
+    # These properties have to be lazy so that we don't have to load any
+    # metadata until/unless it's actually needed.  (i.e., some distributions
+    # may not know their name or version without loading PKG-INFO)
+
+    #@property
+    def key(self):
+        try:
+            return self._key
+        except AttributeError:
+            self._key = key = self.project_name.lower()
+            return key
+    key = property(key)
+
+    #@property
+    def parsed_version(self):
+        try:
+            return self._parsed_version
+        except AttributeError:
+            self._parsed_version = pv = parse_version(self.version)
+            return pv
+
+    parsed_version = property(parsed_version)
+
+    #@property
+    def version(self):
+        try:
+            return self._version
+        except AttributeError:
+            for line in self._get_metadata('PKG-INFO'):
+                if line.lower().startswith('version:'):
+                    self._version = safe_version(line.split(':',1)[1].strip())
+                    return self._version
+            else:
+                raise ValueError(
+                    "Missing 'Version:' header and/or PKG-INFO file", self
+                )
+    version = property(version)
+
+
+
+
+    #@property
+    def _dep_map(self):
+        try:
+            return self.__dep_map
+        except AttributeError:
+            dm = self.__dep_map = {None: []}
+            for name in 'requires.txt', 'depends.txt':
+                for extra,reqs in split_sections(self._get_metadata(name)):
+                    if extra: extra = safe_extra(extra)
+                    dm.setdefault(extra,[]).extend(parse_requirements(reqs))
+            return dm
+    _dep_map = property(_dep_map)
+
+    def requires(self,extras=()):
+        """List of Requirements needed for this distro if `extras` are used"""
+        dm = self._dep_map
+        deps = []
+        deps.extend(dm.get(None,()))
+        for ext in extras:
+            try:
+                deps.extend(dm[safe_extra(ext)])
+            except KeyError:
+                raise UnknownExtra(
+                    "%s has no such extra feature %r" % (self, ext)
+                )
+        return deps
+
+    def _get_metadata(self,name):
+        if self.has_metadata(name):
+            for line in self.get_metadata_lines(name):
+                yield line
+
+    def activate(self,path=None):
+        """Ensure distribution is importable on `path` (default=sys.path)"""
+        if path is None: path = sys.path
+        self.insert_on(path)
+        if path is sys.path:
+            fixup_namespace_packages(self.location)
+            map(declare_namespace, self._get_metadata('namespace_packages.txt'))
+
+
+    def egg_name(self):
+        """Return what this distribution's standard .egg filename should be"""
+        filename = "%s-%s-py%s" % (
+            to_filename(self.project_name), to_filename(self.version),
+            self.py_version or PY_MAJOR
+        )
+
+        if self.platform:
+            filename += '-'+self.platform
+        return filename
+
+    def __repr__(self):
+        if self.location:
+            return "%s (%s)" % (self,self.location)
+        else:
+            return str(self)
+
+    def __str__(self):
+        try: version = getattr(self,'version',None)
+        except ValueError: version = None
+        version = version or "[unknown version]"
+        return "%s %s" % (self.project_name,version)
+
+    def __getattr__(self,attr):
+        """Delegate all unrecognized public attributes to .metadata provider"""
+        if attr.startswith('_'):
+            raise AttributeError,attr
+        return getattr(self._provider, attr)
+
+    #@classmethod
+    def from_filename(cls,filename,metadata=None, **kw):
+        return cls.from_location(
+            _normalize_cached(filename), os.path.basename(filename), metadata,
+            **kw
+        )
+    from_filename = classmethod(from_filename)
+
+    def as_requirement(self):
+        """Return a ``Requirement`` that matches this distribution exactly"""
+        return Requirement.parse('%s==%s' % (self.project_name, self.version))
+
+    def load_entry_point(self, group, name):
+        """Return the `name` entry point of `group` or raise ImportError"""
+        ep = self.get_entry_info(group,name)
+        if ep is None:
+            raise ImportError("Entry point %r not found" % ((group,name),))
+        return ep.load()
+
+    def get_entry_map(self, group=None):
+        """Return the entry point map for `group`, or the full entry map"""
+        try:
+            ep_map = self._ep_map
+        except AttributeError:
+            ep_map = self._ep_map = EntryPoint.parse_map(
+                self._get_metadata('entry_points.txt'), self
+            )
+        if group is not None:
+            return ep_map.get(group,{})
+        return ep_map
+
+    def get_entry_info(self, group, name):
+        """Return the EntryPoint object for `group`+`name`, or ``None``"""
+        return self.get_entry_map(group).get(name)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+    def insert_on(self, path, loc = None):
+        """Insert self.location in path before its nearest parent directory"""
+
+        loc = loc or self.location
+        if not loc:
+            return
+
+        nloc = _normalize_cached(loc)
+        bdir = os.path.dirname(nloc)
+        npath= [(p and _normalize_cached(p) or p) for p in path]
+
+        bp = None
+        for p, item in enumerate(npath):
+            if item==nloc:
+                break
+            elif item==bdir and self.precedence==EGG_DIST:
+                # if it's an .egg, give it precedence over its directory
+                if path is sys.path:
+                    self.check_version_conflict()
+                path.insert(p, loc)
+                npath.insert(p, nloc)
+                break
+        else:
+            if path is sys.path:
+                self.check_version_conflict()
+            path.append(loc)
+            return
+
+        # p is the spot where we found or inserted loc; now remove duplicates
+        while 1:
+            try:
+                np = npath.index(nloc, p+1)
+            except ValueError:
+                break
+            else:
+                del npath[np], path[np]
+                p = np  # ha!
+
+        return
+
+
+    def check_version_conflict(self):
+        if self.key=='setuptools':
+            return      # ignore the inevitable setuptools self-conflicts  :(
+
+        nsp = dict.fromkeys(self._get_metadata('namespace_packages.txt'))
+        loc = normalize_path(self.location)
+        for modname in self._get_metadata('top_level.txt'):
+            if (modname not in sys.modules or modname in nsp
+                or modname in _namespace_packages
+            ):
+                continue
+
+            fn = getattr(sys.modules[modname], '__file__', None)
+            if fn and (normalize_path(fn).startswith(loc) or fn.startswith(loc)):
+                continue
+            issue_warning(
+                "Module %s was already imported from %s, but %s is being added"
+                " to sys.path" % (modname, fn, self.location),
+            )
+
+    def has_version(self):
+        try:
+            self.version
+        except ValueError:
+            issue_warning("Unbuilt egg for "+repr(self))
+            return False
+        return True
+
+    def clone(self,**kw):
+        """Copy this distribution, substituting in any changed keyword args"""
+        for attr in (
+            'project_name', 'version', 'py_version', 'platform', 'location',
+            'precedence'
+        ):
+            kw.setdefault(attr, getattr(self,attr,None))
+        kw.setdefault('metadata', self._provider)
+        return self.__class__(**kw)
+
+
+
+
+    #@property
+    def extras(self):
+        return [dep for dep in self._dep_map if dep]
+    extras = property(extras)
+
+
+def issue_warning(*args,**kw):
+    level = 1
+    g = globals()
+    try:
+        # find the first stack frame that is *not* code in
+        # the pkg_resources module, to use for the warning
+        while sys._getframe(level).f_globals is g:
+            level += 1
+    except ValueError:
+        pass
+    from warnings import warn
+    warn(stacklevel = level+1, *args, **kw)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+def parse_requirements(strs):
+    """Yield ``Requirement`` objects for each specification in `strs`
+
+    `strs` must be an instance of ``basestring``, or a (possibly-nested)
+    iterable thereof.
+    """
+    # create a steppable iterator, so we can handle \-continuations
+    lines = iter(yield_lines(strs))
+
+    def scan_list(ITEM,TERMINATOR,line,p,groups,item_name):
+
+        items = []
+
+        while not TERMINATOR(line,p):
+            if CONTINUE(line,p):
+                try:
+                    line = lines.next(); p = 0
+                except StopIteration:
+                    raise ValueError(
+                        "\\ must not appear on the last nonblank line"
+                    )
+
+            match = ITEM(line,p)
+            if not match:
+                raise ValueError("Expected "+item_name+" in",line,"at",line[p:])
+
+            items.append(match.group(*groups))
+            p = match.end()
+
+            match = COMMA(line,p)
+            if match:
+                p = match.end() # skip the comma
+            elif not TERMINATOR(line,p):
+                raise ValueError(
+                    "Expected ',' or end-of-list in",line,"at",line[p:]
+                )
+
+        match = TERMINATOR(line,p)
+        if match: p = match.end()   # skip the terminator, if any
+        return line, p, items
+
+    for line in lines:
+        match = DISTRO(line)
+        if not match:
+            raise ValueError("Missing distribution spec", line)
+        project_name = match.group(1)
+        p = match.end()
+        extras = []
+
+        match = OBRACKET(line,p)
+        if match:
+            p = match.end()
+            line, p, extras = scan_list(
+                DISTRO, CBRACKET, line, p, (1,), "'extra' name"
+            )
+
+        line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
+        specs = [(op,safe_version(val)) for op,val in specs]
+        yield Requirement(project_name, specs, extras)
+
+
+def _sort_dists(dists):
+    tmp = [(dist.hashcmp,dist) for dist in dists]
+    tmp.sort()
+    dists[::-1] = [d for hc,d in tmp]
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class Requirement:
+    def __init__(self, project_name, specs, extras):
+        """DO NOT CALL THIS UNDOCUMENTED METHOD; use Requirement.parse()!"""
+        self.unsafe_name, project_name = project_name, safe_name(project_name)
+        self.project_name, self.key = project_name, project_name.lower()
+        index = [(parse_version(v),state_machine[op],op,v) for op,v in specs]
+        index.sort()
+        self.specs = [(op,ver) for parsed,trans,op,ver in index]
+        self.index, self.extras = index, tuple(map(safe_extra,extras))
+        self.hashCmp = (
+            self.key, tuple([(op,parsed) for parsed,trans,op,ver in index]),
+            frozenset(self.extras)
+        )
+        self.__hash = hash(self.hashCmp)
+
+    def __str__(self):
+        specs = ','.join([''.join(s) for s in self.specs])
+        extras = ','.join(self.extras)
+        if extras: extras = '[%s]' % extras
+        return '%s%s%s' % (self.project_name, extras, specs)
+
+    def __eq__(self,other):
+        return isinstance(other,Requirement) and self.hashCmp==other.hashCmp
+
+    def __contains__(self,item):
+        if isinstance(item,Distribution):
+            if item.key != self.key: return False
+            if self.index: item = item.parsed_version  # only get if we need it
+        elif isinstance(item,basestring):
+            item = parse_version(item)
+        last = None
+        for parsed,trans,op,ver in self.index:
+            action = trans[cmp(item,parsed)]
+            if action=='F':     return False
+            elif action=='T':   return True
+            elif action=='+':   last = True
+            elif action=='-' or last is None:   last = False
+        if last is None: last = True    # no rules encountered
+        return last
+
+
+    def __hash__(self):
+        return self.__hash
+
+    def __repr__(self): return "Requirement.parse(%r)" % str(self)
+
+    #@staticmethod
+    def parse(s):
+        reqs = list(parse_requirements(s))
+        if reqs:
+            if len(reqs)==1:
+                return reqs[0]
+            raise ValueError("Expected only one requirement", s)
+        raise ValueError("No requirements found", s)
+
+    parse = staticmethod(parse)
+
+state_machine = {
+    #       =><
+    '<' :  '--T',
+    '<=':  'T-T',
+    '>' :  'F+F',
+    '>=':  'T+F',
+    '==':  'T..',
+    '!=':  'F++',
+}
+
+
+def _get_mro(cls):
+    """Get an mro for a type or classic class"""
+    if not isinstance(cls,type):
+        class cls(cls,object): pass
+        return cls.__mro__[1:]
+    return cls.__mro__
+
+def _find_adapter(registry, ob):
+    """Return an adapter factory for `ob` from `registry`"""
+    for t in _get_mro(getattr(ob, '__class__', type(ob))):
+        if t in registry:
+            return registry[t]
+
+
+def ensure_directory(path):
+    """Ensure that the parent directory of `path` exists"""
+    dirname = os.path.dirname(path)
+    if not os.path.isdir(dirname):
+        os.makedirs(dirname)
+
+def split_sections(s):
+    """Split a string or iterable thereof into (section,content) pairs
+
+    Each ``section`` is a stripped version of the section header ("[section]")
+    and each ``content`` is a list of stripped lines excluding blank lines and
+    comment-only lines.  If there are any such lines before the first section
+    header, they're returned in a first ``section`` of ``None``.
+    """
+    section = None
+    content = []
+    for line in yield_lines(s):
+        if line.startswith("["):
+            if line.endswith("]"):
+                if section or content:
+                    yield section, content
+                section = line[1:-1].strip()
+                content = []
+            else:
+                raise ValueError("Invalid section heading", line)
+        else:
+            content.append(line)
+
+    # wrap up last segment
+    yield section, content
+
+def _mkstemp(*args,**kw):
+    from tempfile import mkstemp
+    old_open = os.open
+    try:
+        os.open = os_open   # temporarily bypass sandboxing
+        return mkstemp(*args,**kw)
+    finally:
+        os.open = old_open  # and then put it back
+
+
+# Set up global resource manager (deliberately not state-saved)
+_manager = ResourceManager()
+def _initialize(g):
+    for name in dir(_manager):
+        if not name.startswith('_'):
+            g[name] = getattr(_manager, name)
+_initialize(globals())
+
+# Prepare the master working set and make the ``require()`` API available
+_declare_state('object', working_set = WorkingSet())
+try:
+    # Does the main program list any requirements?
+    from __main__ import __requires__
+except ImportError:
+    pass # No: just use the default working set based on sys.path
+else:
+    # Yes: ensure the requirements are met, by prefixing sys.path if necessary
+    try:
+        working_set.require(__requires__)
+    except VersionConflict:     # try it without defaults already on sys.path
+        working_set = WorkingSet([])    # by starting with an empty path
+        for dist in working_set.resolve(
+            parse_requirements(__requires__), Environment()
+        ):
+            working_set.add(dist)
+        for entry in sys.path:  # add any missing entries from sys.path
+            if entry not in working_set.entries:
+                working_set.add_entry(entry)
+        sys.path[:] = working_set.entries   # then copy back to sys.path
+
+require = working_set.require
+iter_entry_points = working_set.iter_entry_points
+add_activation_listener = working_set.subscribe
+run_script = working_set.run_script
+run_main = run_script   # backward compatibility
+# Activate all distributions already on sys.path, and ensure that
+# all distributions added to the working set in the future (e.g. by
+# calling ``require()``) will get activated as well.
+add_activation_listener(lambda dist: dist.activate())
+working_set.entries=[]; map(working_set.add_entry,sys.path) # match order
+
diff --git a/lib/six.py b/lib/six.py
new file mode 100644
index 00000000..7ec7f1be
--- /dev/null
+++ b/lib/six.py
@@ -0,0 +1,632 @@
+"""Utilities for writing code that runs on Python 2 and 3"""
+
+# Copyright (c) 2010-2014 Benjamin Peterson
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import operator
+import sys
+import types
+
+__author__ = "Benjamin Peterson <benjamin@python.org>"
+__version__ = "1.5.2"
+
+
+# Useful for very coarse version differentiation.
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+if PY3:
+    string_types = str,
+    integer_types = int,
+    class_types = type,
+    text_type = str
+    binary_type = bytes
+
+    MAXSIZE = sys.maxsize
+else:
+    string_types = basestring,
+    integer_types = (int, long)
+    class_types = (type, types.ClassType)
+    text_type = unicode
+    binary_type = str
+
+    if sys.platform.startswith("java"):
+        # Jython always uses 32 bits.
+        MAXSIZE = int((1 << 31) - 1)
+    else:
+        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
+        class X(object):
+            def __len__(self):
+                return 1 << 31
+        try:
+            len(X())
+        except OverflowError:
+            # 32-bit
+            MAXSIZE = int((1 << 31) - 1)
+        else:
+            # 64-bit
+            MAXSIZE = int((1 << 63) - 1)
+        del X
+
+
+def _add_doc(func, doc):
+    """Add documentation to a function."""
+    func.__doc__ = doc
+
+
+def _import_module(name):
+    """Import module, returning the module after the last dot."""
+    __import__(name)
+    return sys.modules[name]
+
+
+class _LazyDescr(object):
+
+    def __init__(self, name):
+        self.name = name
+
+    def __get__(self, obj, tp):
+        result = self._resolve()
+        setattr(obj, self.name, result) # Invokes __set__.
+        # This is a bit ugly, but it avoids running this again.
+        delattr(obj.__class__, self.name)
+        return result
+
+
+class MovedModule(_LazyDescr):
+
+    def __init__(self, name, old, new=None):
+        super(MovedModule, self).__init__(name)
+        if PY3:
+            if new is None:
+                new = name
+            self.mod = new
+        else:
+            self.mod = old
+
+    def _resolve(self):
+        return _import_module(self.mod)
+
+    def __getattr__(self, attr):
+        # Hack around the Django autoreloader. The reloader tries to get
+        # __file__ or __name__ of every module in sys.modules. This doesn't work
+        # well if this MovedModule is for an module that is unavailable on this
+        # machine (like winreg on Unix systems). Thus, we pretend __file__ and
+        # __name__ don't exist if the module hasn't been loaded yet. See issues
+        # #51 and #53.
+        if attr in ("__file__", "__name__") and self.mod not in sys.modules:
+            raise AttributeError
+        _module = self._resolve()
+        value = getattr(_module, attr)
+        setattr(self, attr, value)
+        return value
+
+
+class _LazyModule(types.ModuleType):
+
+    def __init__(self, name):
+        super(_LazyModule, self).__init__(name)
+        self.__doc__ = self.__class__.__doc__
+
+    def __dir__(self):
+        attrs = ["__doc__", "__name__"]
+        attrs += [attr.name for attr in self._moved_attributes]
+        return attrs
+
+    # Subclasses should override this
+    _moved_attributes = []
+
+
+class MovedAttribute(_LazyDescr):
+
+    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
+        super(MovedAttribute, self).__init__(name)
+        if PY3:
+            if new_mod is None:
+                new_mod = name
+            self.mod = new_mod
+            if new_attr is None:
+                if old_attr is None:
+                    new_attr = name
+                else:
+                    new_attr = old_attr
+            self.attr = new_attr
+        else:
+            self.mod = old_mod
+            if old_attr is None:
+                old_attr = name
+            self.attr = old_attr
+
+    def _resolve(self):
+        module = _import_module(self.mod)
+        return getattr(module, self.attr)
+
+
+
+class _MovedItems(_LazyModule):
+    """Lazy loading of moved objects"""
+
+
+_moved_attributes = [
+    MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
+    MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
+    MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
+    MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
+    MovedAttribute("map", "itertools", "builtins", "imap", "map"),
+    MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("reload_module", "__builtin__", "imp", "reload"),
+    MovedAttribute("reduce", "__builtin__", "functools"),
+    MovedAttribute("StringIO", "StringIO", "io"),
+    MovedAttribute("UserString", "UserString", "collections"),
+    MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
+    MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
+
+    MovedModule("builtins", "__builtin__"),
+    MovedModule("configparser", "ConfigParser"),
+    MovedModule("copyreg", "copy_reg"),
+    MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
+    MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
+    MovedModule("http_cookies", "Cookie", "http.cookies"),
+    MovedModule("html_entities", "htmlentitydefs", "html.entities"),
+    MovedModule("html_parser", "HTMLParser", "html.parser"),
+    MovedModule("http_client", "httplib", "http.client"),
+    MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
+    MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
+    MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
+    MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
+    MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
+    MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
+    MovedModule("cPickle", "cPickle", "pickle"),
+    MovedModule("queue", "Queue"),
+    MovedModule("reprlib", "repr"),
+    MovedModule("socketserver", "SocketServer"),
+    MovedModule("_thread", "thread", "_thread"),
+    MovedModule("tkinter", "Tkinter"),
+    MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
+    MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
+    MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
+    MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
+    MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
+    MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
+    MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
+    MovedModule("tkinter_colorchooser", "tkColorChooser",
+                "tkinter.colorchooser"),
+    MovedModule("tkinter_commondialog", "tkCommonDialog",
+                "tkinter.commondialog"),
+    MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_font", "tkFont", "tkinter.font"),
+    MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
+    MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
+                "tkinter.simpledialog"),
+    MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
+    MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
+    MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
+    MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
+    MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
+    MovedModule("winreg", "_winreg"),
+]
+for attr in _moved_attributes:
+    setattr(_MovedItems, attr.name, attr)
+    if isinstance(attr, MovedModule):
+        sys.modules[__name__ + ".moves." + attr.name] = attr
+del attr
+
+_MovedItems._moved_attributes = _moved_attributes
+
+moves = sys.modules[__name__ + ".moves"] = _MovedItems(__name__ + ".moves")
+
+
+class Module_six_moves_urllib_parse(_LazyModule):
+    """Lazy loading of moved objects in six.moves.urllib_parse"""
+
+
+_urllib_parse_moved_attributes = [
+    MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
+    MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
+    MovedAttribute("urljoin", "urlparse", "urllib.parse"),
+    MovedAttribute("urlparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("quote", "urllib", "urllib.parse"),
+    MovedAttribute("quote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("unquote", "urllib", "urllib.parse"),
+    MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("urlencode", "urllib", "urllib.parse"),
+]
+for attr in _urllib_parse_moved_attributes:
+    setattr(Module_six_moves_urllib_parse, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes
+
+sys.modules[__name__ + ".moves.urllib_parse"] = sys.modules[__name__ + ".moves.urllib.parse"] = Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse")
+
+
+class Module_six_moves_urllib_error(_LazyModule):
+    """Lazy loading of moved objects in six.moves.urllib_error"""
+
+
+_urllib_error_moved_attributes = [
+    MovedAttribute("URLError", "urllib2", "urllib.error"),
+    MovedAttribute("HTTPError", "urllib2", "urllib.error"),
+    MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
+]
+for attr in _urllib_error_moved_attributes:
+    setattr(Module_six_moves_urllib_error, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes
+
+sys.modules[__name__ + ".moves.urllib_error"] = sys.modules[__name__ + ".moves.urllib.error"] = Module_six_moves_urllib_error(__name__ + ".moves.urllib.error")
+
+
+class Module_six_moves_urllib_request(_LazyModule):
+    """Lazy loading of moved objects in six.moves.urllib_request"""
+
+
+_urllib_request_moved_attributes = [
+    MovedAttribute("urlopen", "urllib2", "urllib.request"),
+    MovedAttribute("install_opener", "urllib2", "urllib.request"),
+    MovedAttribute("build_opener", "urllib2", "urllib.request"),
+    MovedAttribute("pathname2url", "urllib", "urllib.request"),
+    MovedAttribute("url2pathname", "urllib", "urllib.request"),
+    MovedAttribute("getproxies", "urllib", "urllib.request"),
+    MovedAttribute("Request", "urllib2", "urllib.request"),
+    MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
+    MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FileHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("urlretrieve", "urllib", "urllib.request"),
+    MovedAttribute("urlcleanup", "urllib", "urllib.request"),
+    MovedAttribute("URLopener", "urllib", "urllib.request"),
+    MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
+    MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
+]
+for attr in _urllib_request_moved_attributes:
+    setattr(Module_six_moves_urllib_request, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes
+
+sys.modules[__name__ + ".moves.urllib_request"] = sys.modules[__name__ + ".moves.urllib.request"] = Module_six_moves_urllib_request(__name__ + ".moves.urllib.request")
+
+
+class Module_six_moves_urllib_response(_LazyModule):
+    """Lazy loading of moved objects in six.moves.urllib_response"""
+
+
+_urllib_response_moved_attributes = [
+    MovedAttribute("addbase", "urllib", "urllib.response"),
+    MovedAttribute("addclosehook", "urllib", "urllib.response"),
+    MovedAttribute("addinfo", "urllib", "urllib.response"),
+    MovedAttribute("addinfourl", "urllib", "urllib.response"),
+]
+for attr in _urllib_response_moved_attributes:
+    setattr(Module_six_moves_urllib_response, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes
+
+sys.modules[__name__ + ".moves.urllib_response"] = sys.modules[__name__ + ".moves.urllib.response"] = Module_six_moves_urllib_response(__name__ + ".moves.urllib.response")
+
+
+class Module_six_moves_urllib_robotparser(_LazyModule):
+    """Lazy loading of moved objects in six.moves.urllib_robotparser"""
+
+
+_urllib_robotparser_moved_attributes = [
+    MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
+]
+for attr in _urllib_robotparser_moved_attributes:
+    setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes
+
+sys.modules[__name__ + ".moves.urllib_robotparser"] = sys.modules[__name__ + ".moves.urllib.robotparser"] = Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser")
+
+
+class Module_six_moves_urllib(types.ModuleType):
+    """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
+    parse = sys.modules[__name__ + ".moves.urllib_parse"]
+    error = sys.modules[__name__ + ".moves.urllib_error"]
+    request = sys.modules[__name__ + ".moves.urllib_request"]
+    response = sys.modules[__name__ + ".moves.urllib_response"]
+    robotparser = sys.modules[__name__ + ".moves.urllib_robotparser"]
+
+    def __dir__(self):
+        return ['parse', 'error', 'request', 'response', 'robotparser']
+
+
+sys.modules[__name__ + ".moves.urllib"] = Module_six_moves_urllib(__name__ + ".moves.urllib")
+
+
+def add_move(move):
+    """Add an item to six.moves."""
+    setattr(_MovedItems, move.name, move)
+
+
+def remove_move(name):
+    """Remove item from six.moves."""
+    try:
+        delattr(_MovedItems, name)
+    except AttributeError:
+        try:
+            del moves.__dict__[name]
+        except KeyError:
+            raise AttributeError("no such move, %r" % (name,))
+
+
+if PY3:
+    _meth_func = "__func__"
+    _meth_self = "__self__"
+
+    _func_closure = "__closure__"
+    _func_code = "__code__"
+    _func_defaults = "__defaults__"
+    _func_globals = "__globals__"
+
+    _iterkeys = "keys"
+    _itervalues = "values"
+    _iteritems = "items"
+    _iterlists = "lists"
+else:
+    _meth_func = "im_func"
+    _meth_self = "im_self"
+
+    _func_closure = "func_closure"
+    _func_code = "func_code"
+    _func_defaults = "func_defaults"
+    _func_globals = "func_globals"
+
+    _iterkeys = "iterkeys"
+    _itervalues = "itervalues"
+    _iteritems = "iteritems"
+    _iterlists = "iterlists"
+
+
+try:
+    advance_iterator = next
+except NameError:
+    def advance_iterator(it):
+        return it.next()
+next = advance_iterator
+
+
+try:
+    callable = callable
+except NameError:
+    def callable(obj):
+        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
+
+
+if PY3:
+    def get_unbound_function(unbound):
+        return unbound
+
+    create_bound_method = types.MethodType
+
+    Iterator = object
+else:
+    def get_unbound_function(unbound):
+        return unbound.im_func
+
+    def create_bound_method(func, obj):
+        return types.MethodType(func, obj, obj.__class__)
+
+    class Iterator(object):
+
+        def next(self):
+            return type(self).__next__(self)
+
+    callable = callable
+_add_doc(get_unbound_function,
+         """Get the function out of a possibly unbound function""")
+
+
+get_method_function = operator.attrgetter(_meth_func)
+get_method_self = operator.attrgetter(_meth_self)
+get_function_closure = operator.attrgetter(_func_closure)
+get_function_code = operator.attrgetter(_func_code)
+get_function_defaults = operator.attrgetter(_func_defaults)
+get_function_globals = operator.attrgetter(_func_globals)
+
+
+def iterkeys(d, **kw):
+    """Return an iterator over the keys of a dictionary."""
+    return iter(getattr(d, _iterkeys)(**kw))
+
+def itervalues(d, **kw):
+    """Return an iterator over the values of a dictionary."""
+    return iter(getattr(d, _itervalues)(**kw))
+
+def iteritems(d, **kw):
+    """Return an iterator over the (key, value) pairs of a dictionary."""
+    return iter(getattr(d, _iteritems)(**kw))
+
+def iterlists(d, **kw):
+    """Return an iterator over the (key, [values]) pairs of a dictionary."""
+    return iter(getattr(d, _iterlists)(**kw))
+
+
+if PY3:
+    def b(s):
+        return s.encode("latin-1")
+    def u(s):
+        return s
+    unichr = chr
+    if sys.version_info[1] <= 1:
+        def int2byte(i):
+            return bytes((i,))
+    else:
+        # This is about 2x faster than the implementation above on 3.2+
+        int2byte = operator.methodcaller("to_bytes", 1, "big")
+    byte2int = operator.itemgetter(0)
+    indexbytes = operator.getitem
+    iterbytes = iter
+    import io
+    StringIO = io.StringIO
+    BytesIO = io.BytesIO
+else:
+    def b(s):
+        return s
+    # Workaround for standalone backslash
+    def u(s):
+        return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
+    unichr = unichr
+    int2byte = chr
+    def byte2int(bs):
+        return ord(bs[0])
+    def indexbytes(buf, i):
+        return ord(buf[i])
+    def iterbytes(buf):
+        return (ord(byte) for byte in buf)
+    import StringIO
+    StringIO = BytesIO = StringIO.StringIO
+_add_doc(b, """Byte literal""")
+_add_doc(u, """Text literal""")
+
+
+if PY3:
+    exec_ = getattr(moves.builtins, "exec")
+
+
+    def reraise(tp, value, tb=None):
+        if value.__traceback__ is not tb:
+            raise value.with_traceback(tb)
+        raise value
+
+else:
+    def exec_(_code_, _globs_=None, _locs_=None):
+        """Execute code in a namespace."""
+        if _globs_ is None:
+            frame = sys._getframe(1)
+            _globs_ = frame.f_globals
+            if _locs_ is None:
+                _locs_ = frame.f_locals
+            del frame
+        elif _locs_ is None:
+            _locs_ = _globs_
+        exec("""exec _code_ in _globs_, _locs_""")
+
+
+    exec_("""def reraise(tp, value, tb=None):
+    raise tp, value, tb
+""")
+
+
+print_ = getattr(moves.builtins, "print", None)
+if print_ is None:
+    def print_(*args, **kwargs):
+        """The new-style print function for Python 2.4 and 2.5."""
+        fp = kwargs.pop("file", sys.stdout)
+        if fp is None:
+            return
+        def write(data):
+            if not isinstance(data, basestring):
+                data = str(data)
+            # If the file has an encoding, encode unicode with it.
+            if (isinstance(fp, file) and
+                isinstance(data, unicode) and
+                fp.encoding is not None):
+                errors = getattr(fp, "errors", None)
+                if errors is None:
+                    errors = "strict"
+                data = data.encode(fp.encoding, errors)
+            fp.write(data)
+        want_unicode = False
+        sep = kwargs.pop("sep", None)
+        if sep is not None:
+            if isinstance(sep, unicode):
+                want_unicode = True
+            elif not isinstance(sep, str):
+                raise TypeError("sep must be None or a string")
+        end = kwargs.pop("end", None)
+        if end is not None:
+            if isinstance(end, unicode):
+                want_unicode = True
+            elif not isinstance(end, str):
+                raise TypeError("end must be None or a string")
+        if kwargs:
+            raise TypeError("invalid keyword arguments to print()")
+        if not want_unicode:
+            for arg in args:
+                if isinstance(arg, unicode):
+                    want_unicode = True
+                    break
+        if want_unicode:
+            newline = unicode("\n")
+            space = unicode(" ")
+        else:
+            newline = "\n"
+            space = " "
+        if sep is None:
+            sep = space
+        if end is None:
+            end = newline
+        for i, arg in enumerate(args):
+            if i:
+                write(sep)
+            write(arg)
+        write(end)
+
+_add_doc(reraise, """Reraise an exception.""")
+
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    return meta("NewBase", bases, {})
+
+def add_metaclass(metaclass):
+    """Class decorator for creating a class with a metaclass."""
+    def wrapper(cls):
+        orig_vars = cls.__dict__.copy()
+        orig_vars.pop('__dict__', None)
+        orig_vars.pop('__weakref__', None)
+        slots = orig_vars.get('__slots__')
+        if slots is not None:
+            if isinstance(slots, str):
+                slots = [slots]
+            for slots_var in slots:
+                orig_vars.pop(slots_var)
+        return metaclass(cls.__name__, cls.__bases__, orig_vars)
+    return wrapper