Update phone screen animations. Bug 878871.
Update nav js to activate adaptive chevron on #soccer-hook. Bug 878871.
Update nav chevron detection and mobile slider toggle CSS bug 878871
Cache-bust a few remaining style guide images
(Bug 881125)
Enable get phone Spain (es) Firefox OS bug 878871
Remove note about Playdoh from CONTRIBUTING.md

All open pull requests were submitted after the Playdoh upgrade.
Add visual design guidelines for Firefox OS
Bugs 870998 872747 8873482 872747 884424 863160