Tweaks to notifications comment user display

Moves some views around and adds the site title/url to the comment detail view.

New look:
![screen shot 2014-10-24 at 3 25 31 pm](https://cloud.githubusercontent.com/assets/789137/4777242/d5cdf544-5bcc-11e4-8a15-0fc90533f529.png)

![mtiwnja4njmzotu5ntgxmtk2](https://cloud.githubusercontent.com/assets/3903757/4789243/f9708df2-5dc2-11e4-98a5-e0094a513912.jpg)