Feature/add facebook picto

# What I did?

I added a facebook picto to the list of icons. I did not have to make a circle picto, it is in a future TODO.

![screen shot 2014-09-22 at 12 30 26 pm](https://cloud.githubusercontent.com/assets/5713670/4359873/08587ec8-4276-11e4-898a-f3ecf4c1b877.png)