public function delete($url, array $data = array(), array $extra = array())
    {
        $curl = new Curl(array(
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CUSTOMREQUEST => 'DELETE',
            CURLOPT_POSTFIELDS => http_build_query($data)
        ), $extra);

        return $curl->exec();
    }