Replace &amp; in the Tweet text with &.

The snippets service is a bit naive and assumes all template variables
must be valid XML data. In this case it doesn’t, but the service forces
you to escape & properly, so this reverse it so that you can include an
ampersand in your tweet.
Emergency tweaks to fix the template for locales using quotes (French!).
Add variation of 10th anniversary snippet that has no sharing.
Remove errant width declaration from 10th anniversary snippet.
Add add-on install snippet.
Add templates for 10th anniversary video snippet.
Fix ampersands in 10th anniversary video template sharing URLs.
Update tail animation URL.
Add replay button to anniversary video.
Fix issues with single quotes in certain strings.
Fix spacing in anniversary video snippet.
Mofo 2014 tame snippet deliverable
Bug 1104061: Ensure snippet ID is included in mofo donation links.
Update fxos animation to support different phones and refactor.
Make space between fxos logo animation and search bar not clickable.
Bug 1105238: Fix alignment of video in RTL locales.
Bug 1105238: Fix alignment of logo animation in RTL locales.
deliverable for v2 of mofo eoy snippet
Small fixes to accommodate retina icon.
Merge branch 'master' of https://github.com/mozilla/snippets into edit-button

Conflicts:
	mofo-eoy-2014/deliverable/snippet-embeddable.html