Implemented binding to LibrarySyncService to check if there are items currently
syncing or queued to sync. This makes it possible to inform user of background
sync processes.
Created two abstract classes to reduce code duplication and check if
LibrarySyncService has any items queued which are currently being displayed.
Fixed issue with SwipeRefreshLayout from appcompat library, which does not
always show the refresh animation when refresh is set to true.
Implemented context menus in GridView items in AlbumListFragment,
ArtistListFragment and AudioGenreListFragment.
This allows the user to add everything from an artist, album, or
genre by popping up the context menu and selecting either play
or Add to playlist.
Created a new class utils/MediaManager to hold any methods related
to managing media. Added methods play(...) and queueAudio(...) to
add musiclist items to the current playlist and start playing.