Remove repeated code

src/github/GitObject.py

@@ -2,11 +2,7 @@
 # Do not modify it manually, your work would be lost.
 
 import PaginatedList
-# This allows None as a valid value for an optional parameter
-
-class DefaultValueForOptionalParametersType:
-    pass
-DefaultValueForOptionalParameters = DefaultValueForOptionalParametersType()
+from GithubObject import *
 
 class GitObject( object ):
     def __init__( self, requester, attributes, lazy ):