Sort album models by artist name first.
Make sure album grid on collection page is sorted.
Updated ChangeLog.
Renamed LoadXSPFDialog to LoadPlaylistDialog.
Renamed importXSPF to importPlaylist in ActionCollection.
Renamed importXspfPath to importPlaylistPath in TomahawkSettings.
Style fixes for M3uLoader.
Support loading m3u playlists from 'Import Playlist' dialog.
Updated ChangeLog.