use externalFilesDir when creating a database to make sure we don't need permissions here
revert Support Design library to previous version, had issues with 23.x
- work around Mono bug in GZipStream (see http://sourceforge.net/p/keepass/bugs/1373/) by including a custom GZipStream implementation
- fixed issue with export database to System file picker location
- fixed issues with preference options crashing with ActivityNotFound (due to changes in Xamarin 5.1, see https://bugzilla.xamarin.com/show_bug.cgi?id=33617
updated manifest/changelog
* EntryEditActivity: support content-URIs and extracting display names from them
* AndroidContentStorage.cs, SelectStorageLocationActivityBase.cs: support for SAF with persistable URI permissions
* FileChooser returns URI as data
* CreateDatabaseActivity.cs supports content URIs
* FileStorageSelectionActivity: doesn't show "Local file" anymore, now system file picker on KitKat
CreateDatabaseActivity: Passing app task to next activity
Keepass.cs: added documentation on Activities and AppTasks
SearchActivity.cs: passing appTask to next activity, using ForwardResult to pass ActivityResult back to previous activity
FileSelectActivity: pass AppTask to CreateDatabaseActivity, Recreate instead of Start+Finish (to have correct handling of ActivityResults)
Fixed bug which prohibited creating databases on FTP/HTTP/WebDav (no credentials were queried)
Fixed bug which prohibited to use the Android 4.4 KITKAT file picker
Removed permission for internal file browser to allow using the internal picker in 4.4 as well (Security Exception)