/**
  * Get REST client instance
  *
  * @return null|RestClient
  */
 public static function getRestClient()
 {
     if (is_null(self::$restClient)) {
         self::$restClient = new RestClient(array('base_url' => 'https://app.getsitecontrol.com/api/v1', 'headers' => array('Content-Type' => 'application/json')));
     }
     return self::$restClient;
 }