/**
  * Returns and/or create the single instance of this class.  
  *
  * @return  Charitable_Benefactors
  * @access  public
  * @since   1.0.0
  */
 public static function get_instance()
 {
     if (is_null(self::$instance)) {
         self::$instance = new Charitable_Benefactors();
     }
     return self::$instance;
 }