Start responses.

lms/static/coffee/src/discussion/views/discussion_thread_view.coffee

@@ -18,6 +18,7 @@ class @DiscussionThreadView extends Backbone.View
     if window.user.voted(@model)
       @$(".vote-btn").addClass("is-cast")
     @$("span.timeago").timeago()
+    DiscussionUtil.makeWmdEditor @$el, $.proxy(@$, @), "reply-body"
     @renderResponses()
     @
 

lms/templates/discussion/single_thread.html

@@ -123,6 +123,7 @@
     </div>
     <ol class="responses">
     </ol>
+    <div class="response-body"></div>
   </article>
 </script>