apply ckeditor on multiple entities

Apply ckeditor into:

* activity;
* task;
* document;
* accompanying periods

src/Bundle/ChillTaskBundle/Resources/views/SingleTask/show.html.twig

@@ -37,7 +37,7 @@
             <span class="chill-no-data-statement">{{"No description"|trans}}</span>
             {% else %}
             <blockquote class="chill-user-quote">
-            {{ task.description }}
+            {{ task.description|chill_markdown_to_html }}
             </blockquote>
             {% endif %}
         </dd>