bolt/bolt — pull request #1137 by xiaohutai (2014-04-25 09:30:24+00:00)
Title: Setting $app variable to protected, which may be useful for 0c18498c

Otherwise override in constructor, like so:

```
public function __construct(Silex\Application $app, $contenttype = "", $values = "")
{
parent::__construct($app, $contenttype, $values);
$this->app = $app;
}
```