use huh color for external link in footer

Before:
![screen shot 2014-07-01 at 13 56 01](https://cloud.githubusercontent.com/assets/749864/3442598/b4f6df68-0116-11e4-9942-7f8656c15acd.png)

After:
![screen shot 2014-07-01 at 13 55 38](https://cloud.githubusercontent.com/assets/749864/3442599/b90482a4-0116-11e4-96e5-ea66995d92b7.png)