Removed static callbacks. Fixes #50.
Instead of a flag removed the root playlistcontainer callbacks after the desired ready callback has been called.
Fixed a bug where NodePlaylistContainer always uses the playlist container of the logged in user instead of the wrapped one.
Removed deprecated functions.
Playlist callbacks are now settable by an object and not by event names anymore.
Playlist container callbacks are now settable by an object and not by event names
anymore.
Player callbacks are now settable by an object and not by event names
anymore.
Removed unnecessary classes and files. Fixes #49
Merge branch 'callbacksObject' into development