Styled chat to fit new design

Still in progress. Here's a screenshot of what I have so far.

Depends on #103.

![screen shot 2014-11-21 at 2 48 26 pm](https://cloud.githubusercontent.com/assets/6354033/5151022/8d5e54b2-718d-11e4-8215-ec93832307f4.png)

Is this the right way to see who wrote a comment?