Small refactor for playlist handlers
Adds playlist name when listing playlists
Adds Playlist.append method
Adds Playlist.extend method
Improves specs a little
Adds ipodio playlist add command handler
Changes filesystem fixtures to work with absolute paths
Speeds up filesystem tests by making them take place in /tmp
Improve test time in 10 seconds by reorganizing specs
Adds Playlist.is_master property
Adds Playlist.remove method
Adds Playlist.discard method
Adds Database.remove_playlist method
Adds ipodio playlist rm command handler
Merge branches 'fixtures', 'playlist_add' and 'playlist_rm'

Conflicts:
	ipodio/cli.py
	ipodio/database.py
	ipodio/handlers.py
	spec/ui/_ipod_helpers.py
	spec/unit/playlist_spec.py