code: public function setPackOptions(Container $app) {
          foreach ($this->packOptions as $key => &$value) {
              $key = $this->_ns($key);
              if (isset($app[$key])) {
                  $value = $app[$key];
              }
          }
      }
docs: Set the pack's options from the app container.
  @see \Quazardous\Silex\Api\OptionnablePackInterface::setPackOptions()
  @param Container $app