Merging up development to staging

Includes:

* https://bugzilla.mozilla.org/show_bug.cgi?id=847258 - where strings too long for urllib to parse would throw a 500 on the site
* a fix for the new nav items we added for mobile
* CSS required for the /party/ page
* a new waffle switch to alternate between /about/ or /party/ to appear in the main nav