Timeago comments correctly.

lms/static/coffee/src/discussion/discussion_router.coffee

@@ -16,8 +16,6 @@ class @DiscussionRouter extends Backbone.Router
 
   allThreads: ->
     @nav.updateSidebar()
-    # TODO: Do something reasonable here
-    # $(".discussion-column").html($('#blank-slate-template').html())
 
   setActiveThread: =>
     if @thread

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

@@ -10,7 +10,7 @@ class @ResponseCommentView extends DiscussionContentView
     @initLocal()
     @delegateEvents()
     @renderAttrs()
-    @$(".timeago").timeago()
+    @$el.find(".timeago").timeago()
     @convertMath()
     @
   convertMath: ->

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

@@ -15,7 +15,7 @@ class @ThreadResponseView extends DiscussionContentView
     if window.user.voted(@model)
       @$(".vote-btn").addClass("is-cast")
     @renderAttrs()
-    @$(".posted-details").timeago()
+    @$el.find(".posted-details").timeago()
     @convertMath()
     @renderComments()
     @