Added UserPreferences class, limit access to unreadItems and queue
limited access to feed items, feeds, playback history and download log
Implemented EventDistributor
Added more documentation to FeedManager
FeedImageLoader now works independently from FeedImages
Implemented PlaybackPreferences
ImageView tags weren't set correctly
PlaybackService now works with the 'Playable' interface
Created de.danoeh.antennapod.util.playback package
Added support for playing local external media files
Added support for local external video files
Renamed getFileUrl method of Playable interface
FeedItem shownotes weren't always loaded correctly
Fixed crash when audio focus was lost
Implemented OnlineFeedViewActivity
Added default getView() implementation for itemlistadapter
Merge branch 'apichanges' into develop
Merge branch 'online_feed_view' into develop