Removes the vocab from the definiton triplestore

        args:
            vocab_name: the name or uri of the vocab to return

def drop_vocab(self, vocab_name, **kwargs):
        """ Removes the vocab from the definiton triplestore

        args:
            vocab_name: the name or uri of the vocab to return

        """
        vocab_dict = self.__get_vocab_dict__(vocab_name, **kwargs)
        return self.drop_file(vocab_dict['filename'], **kwargs)