Add disqus comment counts to homepage.

![screen shot 2014-11-09 at 22 22 35](https://cloud.githubusercontent.com/assets/553566/4969448/7635803e-6860-11e4-9b45-390a789b6c66.png)

Apologies, the joy of compass versions means that it's recompiled the format of some of the css. Perhaps we should consider adding a gemfile?