Renamed PlaylistBrowser to IMusicBrowser. This interface is used in Fragments that show a ListView of items from the media library.
Fixed padding.
Skinnier progress track.
Moved the playback listener for the footer from MainActivity into FooterControlsFragment.
Moved the logic for the drawer and action bar out of the MainActivity and put into the NavigationFragment.
Made the NavigationFragment the controller of MusicBrowserFragment. MusicBrowserFragment remembers what page you left off at and restores it in onCreate.
Created a generic adapter to display lists of albums with album art.
Inheriting from AlbumListAdapter, ArtistAlbumsAdapter shows all the albums for a given artist, while AlbumsAllAdapter shows all albums.