Clean up. NonCompletableGithubObject refactoring resolved.
Change CompletableGithubObject.__init__ without breaking build.
Update RepositoryKey.py
Update AuthenticatedUser.py
Update Authorization.py
Update AuthorizationApplication.py
Update Commit.py and GitCommit.py
Update CommitComment.py
Update Comparision.py
Update ContentFile.py
Update Download.py
Update Gist*.py