added IServerResponseProvider for raw server json response
removed support for raw json, instead added new BaseData for data types with the dictionary AdditionalData which will contain all extra json properties that didn't get parsed.
Ratings endpoint and Playlist addition

Added the Ratings endpoint and added to the Playlist functionality
Merged in changes from the original repo
Corrected some issues with the last merge
Added Playlist endpoint functionality

Added ability to update the tracks for a playlist