Bug 864352 - Implement base Sandstone CSS, r=pike
Bug 864357 - Redesign homepage and Bug 864360 - Embed Firefox in your language video, r=pike
bug 883118, homepage follow up, fix tests, r=jezdez.
When adding tabzilla to elmo, we started including external assets via
//domain.org/foo. Exclude those from assets tests.
bug 883118, remove unused code for the homepage that created two chunks of locales, r=jezdez
Merge branch 'develop' into feature/bug883128-use-static-template-tag

Conflicts:
	apps/homepage/templates/homepage/index.html
	apps/privacy/templates/privacy/versions.html
	apps/pushes/templates/pushes/diff.html
	apps/pushes/templates/pushes/pushlog.html
	apps/shipping/templates/shipping/signoffs.html
	templates/base.html
Removed unneeded check in the static test now that we use the static template tag and not STATIC_URL anymore.