Improve Embeddable Comment Render

* render embeddable comment into twig template;
* add some style

src/Bundle/ChillMainBundle/config/services/templating.yaml

@@ -34,6 +34,7 @@ services:
     Chill\MainBundle\Templating\Entity\CommentRender:
         arguments:
             - '@chill.main.user_repository'
+            - '@Symfony\Component\Templating\EngineInterface'
         tags:
             - { name: 'chill.render_entity' }