inbox page

The feedpage was feeling very cluttered in the three-column layout, so I decided to try moving the notifications out into an inbox page.

The updated feedpage:

![screenshot from 2014-10-15 16 01 22](https://cloud.githubusercontent.com/assets/1270099/4653502/8748e3a4-54ae-11e4-9d41-1322d0ae9e4e.png)