/**
  * Returns an instance of this class.
  *
  * @author Leo Fajardo (@leorw)
  * @since  1.0.0
  *
  * @return RW_Workflows
  */
 static function instance()
 {
     if (!isset(self::$_instance)) {
         self::$_instance = new RW_Workflows();
     }
     return self::$_instance;
 }