HackerNews: better color of footer text

As per @chrismorast on https://github.com/duckduckgo/zeroclickinfo-spice/pull/976#issuecomment-49916518

![screenshot - 07232014 - 05 01 33 pm](https://cloud.githubusercontent.com/assets/4411471/3680225/d090adce-12ac-11e4-9634-d1a3a1364f5a.png)

Sorry for jumping the gun about the last PR...