Make forum New Post buttons behave as buttons

JIRA: FOR-205

common/static/coffee/src/discussion/discussion_module_view.coffee

@@ -5,6 +5,8 @@ if Backbone?
       "keydown .discussion-show":
         (event) -> DiscussionUtil.activateOnSpace(event, @toggleDiscussion)
       "click .new-post-btn": "toggleNewPost"
+      "keydown .new-post-btn":
+        (event) -> DiscussionUtil.activateOnSpace(event, @toggleNewPost)
       "click .new-post-cancel": "hideNewPost"
       "click .discussion-paginator a": "navigateToPage"
 
@@ -19,7 +21,7 @@ if Backbone?
       else
         @page = 1
 
-    toggleNewPost: (event) ->
+    toggleNewPost: (event) =>
       event.preventDefault()
       if !@newPostForm
         @toggleDiscussion()

common/static/coffee/src/discussion/discussion_router.coffee

@@ -16,6 +16,7 @@ if Backbone?
         @nav.on "thread:created", @navigateToThread
         @newPost = $('.new-post-article')
         $('.new-post-btn').bind "click", @showNewPost
+        $('.new-post-btn').bind "keydown", (event) => DiscussionUtil.activateOnSpace(event, @showNewPost)
         $('.new-post-cancel').bind "click", @hideNewPost
 
     allThreads: ->