Move leaderboard below nav

Static layout:
![screen shot 2014-09-24 at 16 08 51](https://cloud.githubusercontent.com/assets/271645/4390421/18c19c62-43fd-11e4-9bf3-eb84720893c4.png)

Responsive layout:
![screen shot 2014-09-24 at 16 11 08](https://cloud.githubusercontent.com/assets/271645/4390422/18c68e52-43fd-11e4-84a8-2c4609f6bd9d.png)