Missing gh btn

navigate to `https://lhorie.github.io/mithril/`

## missing gh button - screenshot
![screen shot 2014-10-31 at 4 47 43 pm](https://cloud.githubusercontent.com/assets/1154834/4869991/59258188-6158-11e4-9c86-00f0e549c64f.png)

## fixed
![screen shot 2014-10-31 at 4 48 51 pm](https://cloud.githubusercontent.com/assets/1154834/4869997/8e8f6136-6158-11e4-86c5-44bf264cd1b7.png)