* fixed: some unicode problems.
* fix: a typo in the function name Exceptionable.clear_errors()
* fixed: User.fetchPlaylist (#3)
* api change: User.getPlaylistsIDs is now User.getPlaylistsData, and User.getPlaylistsIDs returns a list of IDs now.
* Added new webservices as: Track.getId, Track.getDuration, Track.getListenerCount, Track.getPlayCount, Track.getAlbumName, Track.getAlbum, Track.getImage, Event.share.
* Reverted where all objects retrieve all available metadata on the server from the server, now optional.