* added TheTVDB support
* added ehcache to libs (now used in TheTVDBClient and TVRageClient)
* Season spinner will remember unlocked value
Refactoring:
* renamed HtmlUtil to WebRequest
* added getDocument() convenience methods to WebRequest
* added lots of static imports (XPathUtil, WebRequest, FileBotUtil, ...)
* TheTVDBClient and TVRageClient will throw SeasonOutOfBoundsException if for illegal season numbers
* XPathUtil will wrap NodeList with NodeListDecorator instead of creating a new ArrayList
* added DOM convenience methods to XPathUtil for performance reasons
* formatting of episode number in EpisodeListClient, EpisodeListRequestProcesser will take care of this
* added initial size to some StringBuilders
