public function logout($redirect = '/', $token = null)
    {
        $current_token = $token ?: $this->parseToken();

        if ( $redirect and $current_token )
        {
            $this->session->forget('googleapi_token');

            $this->client->revokeToken($current_token);

            return $this->redirect->to($redirect);
        }

        return false;
    }