Restore rendering of group update and end session messages

The previous work to refactor bubbles broke rendering for these message
types. :0/

Gruntfile.js

@@ -167,7 +167,10 @@ module.exports = function(grunt) {
         '!js/modules/**/*.js',
         '!js/models/conversations.js',
         '!js/models/messages.js',
+        '!js/views/conversation_search_view.js',
         '!js/views/conversation_view.js',
+        '!js/views/debug_log_view.js',
+        '!js/views/message_view.js',
         '!js/Mp3LameEncoder.min.js',
         '!js/WebAudioRecorderMp3.js',
         'test/**/*.js',