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>

src/Bundle/ChillTaskBundle/Resources/views/Timeline/single_task_transition_person_context.html.twig

@@ -18,7 +18,7 @@
                     <dt class="inline">{{ 'Description'|trans }}</dt>
                     <dd>
                         <blockquote class="chill-user-quote">
-                            {{ event.task.description }}
+                            {{ event.task.description|chill_markdown_to_html }}
                         </blockquote>
                     </dd>
                 {% endif %}