fixed some serialization issues regarding PlaylisteEntries and Songs and added some missing specs
fixed an issue with serializing/deserializing ojects which inherit from MediaModelBase
fixed failing spec
removed duplicate event subscription
removed duplicate code The navigation service was set in both a property and a field
added some checks to fix some possible crashes with no descriptive error information
added the DeletePlaylist result
minor code refactoring
modified the way the bottom bar view model is set for collection view models
added the playlist bottombar viewmodel and added the delete functionality to the ManagePlaylistsViewModel
added the SavePlaylistViewModel and implemented saving new playlists
fixed line used for testing
added the ability to update a playlist
fixed some failing specs and moved the delete playlist implementation into the playlistbottombarviewmodel
added the ability to rename a playlist
added disabling of save playlist dialog controls while saving
Merge pull request #55 from cristi-badila/addSupportForPlaylists

Add support for playlists