public function render($withHeader = true)
  {
    // DEBUG
    if (isset($_GET['twigDebug']) && $_GET['twigDebug'] == 1) {
      $this->debug();
    }

    $this->template = $this->twig->loadTemplate($this->filename);

    if ($withHeader === true) {
      header('X-UA-Compatible: IE=edge,chrome=1');
      header('Content-Type: text/html; charset=utf-8');
    }

    return $this->template->render($this->data);
  }