Add option to return bytes stream to workbooks.download() method #811

if no_extract is False or no_extract is True:
    import warnings
    warnings.warn('no_extract is deprecated, use include_extract instead.', DeprecationWarning)
    include_extract = not no_extract

if not include_extract:
    url += "?includeExtract=False"

with closing(self.get_request(url, parameters={"stream": True})) as server_response:
    _, params = cgi.parse_header(server_response.headers['Content-Disposition'])
    filename = to_filename(os.path.basename(params['filename']))
    if filepath:
        download_path = make_download_path(filepath, filename)

        with open(download_path, 'wb') as f:
            for chunk in server_response.iter_content(1024):  # 1KB
                f.write(chunk)
        logger.info('Downloaded workbook to {0} (ID: {1})'.format(download_path, workbook_id))
        return os.path.abspath(download_path)
    if stream:
        return server_response.content