Add slashes to sublinks

Before:
![screen shot 2014-10-17 at 15 01 37](https://cloud.githubusercontent.com/assets/1607666/4679888/11f3a612-5606-11e4-855b-4e698b6ef2e8.png)

After:
![screen shot 2014-10-17 at 15 01 44](https://cloud.githubusercontent.com/assets/1607666/4679885/0ea8b524-5606-11e4-913d-51d78f545afe.png)