make markdown & latex work for response / comments (not perfect)

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

@@ -4,4 +4,11 @@ class @ResponseCommentView extends Backbone.View
   render: ->
     @$el.html(@template(@model.toJSON()))
     @$(".timeago").timeago()
+    @convertMath()
     @
+  convertMath: ->
+    body = @$(".response-body")
+    body.html DiscussionUtil.postMathJaxProcessor DiscussionUtil.markdownWithHighlight body.html()
+    body.children("p").each (index, elem) ->
+      $(elem).replaceWith($(elem).html())
+    MathJax.Hub.Queue ["Typeset", MathJax.Hub, body[0]]

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

@@ -17,7 +17,7 @@ class @ThreadResponseView extends Backbone.View
   convertMath: ->
     element = @$(".response-body")
     element.html DiscussionUtil.postMathJaxProcessor DiscussionUtil.markdownWithHighlight element.html()
-    MathJax.Hub.Queue ["Typeset", MathJax.Hub, element.attr("id")]
+    MathJax.Hub.Queue ["Typeset", MathJax.Hub, element[0]]
 
   renderComments: ->
       @model.get("comments").each @renderComment

lms/templates/discussion/_underscore_templates.html

@@ -72,7 +72,7 @@
 </script>
 
 <script type="text/template" id="response-comment-template">
-  <p>${'<%- body %>'}<span class="posted-details">–posted <span class="timeago" title="${'<%- created_at %>'}">sometime</span> by <a href="${'<%- user_url %>'}">${'<%- username %>'}</a></span></p>
+  <p><span class="response-body">${'<%- body %>'}</span><span class="posted-details">–posted <span class="timeago" title="${'<%- created_at %>'}">sometime</span> by <a href="${'<%- user_url %>'}">${'<%- username %>'}</a></span></p>
 </script>
 
 <script type="text/template" id="thread-list-item-template">