Turn off android animation for small screens
[Bug 815636] New: /firefox/fx looks bad with a 855px browser width
Updates to State of Mozilla

* Bug 812206 - modal overlay z-index
* Bug 812338 - add link to /contribute
* Bug 811477 - alt text for video images
* Switched inline images to media function instead of the MEDIA_URL constant.
* Added hreflang to several links.
* Bug 812338 - Add Get Involved link for en locales
We can display this link to more locales once the Get Involved page is localized.
Add Aurora warning to /firefox/channel page
(Bug 701178)
Merge pull request #530 from mozilla/bug-701178-nightly-warning

Bug 701178  Add Aurora/Beta warning to /firefox/channel page
Add download links to Firefox OS app icon page
Bug 744271: Use relative URLs in tabzilla CSS.
Bug 821384: Set WT sample rate to 50.
Merge branch 'master' of github.com:mozilla/bedrock
Bug 816565 - Protect the Web shirt promo

Commented out the Firefox shirt promo; it will return soon.
Also added background colors so promos are readable without images.
Some minor code tidying.
Bug 744271: Do not use new tabzilla URLs in base template.

If we use the new tabzilla URLs in the base template, the JS will fail
to load without a /b/ redirect, but we want this out in production
before putting out that redirect. So we'll stick to the old URL, which
will work before and after the switch.
Bug 744271: Serve dev CSS if TEMPLATE_DEBUG is true.

Adds the ability to use callables as redirects and uses that to send a
different redirect for the Tabzilla CSS if TEMPLATE_DEBUG is true.
Bug 821330: Fix translations on contribute page.

* Fix gettext lazy to be able to find additional lang files specified in
  python modules.
* Mark all translated strings a safe so that html entities aren't
  escaped.
* Add `lang_files` kwarg to _() and _lazy() for searching alternate
  lang files for only that string. This will _NOT_ alter extraction.
Redirect Firefox for Android privacy link
Bug 815527 - Firefox Android privacy link is wrong [need redirect]
Merge pull request #536 from sgarrity/bug-815527-android-privacy-redirect

Redirect Firefox for Android privacy link
Merge pull request #534 from craigcook/bug-816565-home-fundraising-promos

Bug 816565 - Protect the Web shirt promo
Redirect old mission page to new mission page
Bug 821047
Merge pull request #535 from pmclanahan/bug-821330-contribute-form-not-translating

Bug 821330: Fix translations on contribute page.
Bug 816565 - move shirt promo to the first slot
Merge pull request #503 from sgarrity/bug-815636-fx-responsive

Turn off android animation for small screens
Merge pull request #539 from craigcook/bug-816565-home-fundraising-promos

Bug 816565 - move shirt promo to the first slot