Download pre-prepared data by UUID

        :type uuid: str
        :param uuid: Data UUID

        :type output_format: str
        :param output_format: Output format of the data, either "gzip" or "text"

        :rtype: str
        :return: The downloaded content

def download(self, uuid, output_format='gzip'):
        """
        Download pre-prepared data by UUID

        :type uuid: str
        :param uuid: Data UUID

        :type output_format: str
        :param output_format: Output format of the data, either "gzip" or "text"

        :rtype: str
        :return: The downloaded content
        """

        if output_format.lower() not in ('gzip', 'text'):
            raise Exception("output_format must be one of file, text")

        data = {
            'format': output_format,
            'uuid': uuid,
        }
        return self.get('download', get_params=data, is_json=False)