extracted the IMediaModel interface and the MediaModel class
added the Playlist and PlaylistEntry classes
added the ability to load a list of existing playlists from subsonic
added the ManagePlaylist ViewModel/View and implemented its population
added the GetPlaylistResult class and modified the ManagePlaylistViewModel to use it and load remote playlists
added the ability to load remote  playlist items
removed redundant code from playlist item
updated some subsonic results which did not dispose xml readers
Merge pull request #54 from cristi-badila/addSupportForPlaylists

Add support for playlists