def write_collection(self, collection_id, file_content, branch, author):
        """Given a collection_id, temporary filename of content, branch and auth_info

        Deprecated but needed until we merge api local-dep to master...

        """
        gh_user = branch.split('_collection_')[0]
        msg = "Update Collection '%s' via OpenTree API" % collection_id
        return self.write_document(gh_user,
                                   collection_id,
                                   file_content,
                                   branch, author,
                                   commit_msg=msg)