Fix doc for raw_data (issue #144)

github/__init__.py

@@ -17,6 +17,8 @@
 The primary class you will instanciate is :class:`github.MainClass.Github`.
 From its ``get_``, ``create_`` methods, you will obtain instances of all Github objects
 like :class:`github.NamedUser.NamedUser` or :class:`github.Repository.Repository`.
+
+All classes inherit from :class:`github.GithubObject.GithubObject`.
 """
 
 import logging