fixup to previous commit
Fixup to eslam's commit
Follow changes to mockup for Playlists view
view: Add header bar on Playlists view
toolbar: Add selection-mode-changed signal
view: Set sidebar and menu button insensitive in selection mode
view: Play first song when Play is selected in Playlists view menu
playlists: Implement delete_playlist
view: Implement playlist deletion in Playlists view
query: Add new query to get song using a url
grilo: Use tracker for get_media_from_uri

Remove use of grl-filesystem in grilo, since we now use tracker. This should
give us more complete metadata.
playlists: Fix creation of playlist
view: Updates to Playlists view to match changes in grilo