Load message list over JSON

- Add jquery-load-template to bower
- Add moment (date rendering) to bower
- Load message list JSON via /api/v1/mailbox
- Render message list using jquery template
- Fix resize related problems with message list height caused by
  2092949dbc

themes/bootstrap/public/bower_components/moment/templates/globals.js

@@ -0,0 +1,5 @@
+/*global window:false*/
+
+import moment from "./moment";
+
+window.moment = moment;