v0.2.0

Added classes for some function returns
Added some more exception handling
Added function to get giftshop items
Added function to get history of points collected, earned or spent
Added function to get information about the current user
Added function to change information about the current user
Removed option to login when creating an instance of the APISession class, use APISession.login() after creating an instance.
Removed APISession.earned_points property, use APISession.get_earned_points() instead.