/**
  * Retorna a instancia do contexto da aplicacao
  * @param type $module
  * @param type $controller
  * @param type $action
  * @return Ibe_Context
  */
 public static function getInstance($module = NULL, $controller = NULL, $action = NULL, $is_https = FALSE)
 {
     if (is_null(self::$instance)) {
         self::$instance = new self($module, $controller, $action);
     }
     return self::$instance;
 }