Allow using multiple template candidates when rendering twig template (like include)

``` php
// there is no possibility do smth like this
$templates = array(
    sprintf('MissProjectBundle:StaticPage:custom/%s', $page['template']),
    'MissProjectBundle:StaticPage:static_page_layout.html.twig'
);

return $this->render($templates);

// and we should use workaround
return new Response($this->get('twig')->resolveTemplate($templates)->render(array()));
```
