The following method are wrapped:
- /users/{user_id}/playlists/{kind}
- /users/{user_id}/playlists/create
- /users/{user_id}/playlists/{kind}/delete
- /users/{user_id}/playlists/{kind}/name
- /users/{user_id}/playlists/{kind}/change
Added auxiliary difference class
Added "is_mine" and "rename" methods to playlist
All cover fields are now optional... Added "error" field