Start showing the FOIA libraries again

We changed the API to represent reading_rooms as foia_libraries but did not update our corresponding Django templates. Reading rooms were not showing up on the contact landing pages. 

This fixes the templates, and adds tests to ensure that there's a test failure if the foia libraries aren't rendered. 
Also, there are some PEP8 related changes. 

![selfie-0](http://i.imgur.com/ylXQiZb.png)