Bug 860848 - change update link

Change from /firefox/ to /firefox/update.
Bug 861231 - Video control-overlay link is missing a descriptive text on what it actually does
Added data-overlay-hidden-text attribute on .mozilla-video-control video elements
modified mozilla-video-tools.js to use that string.
Bug 855734 - Strip trailing "." from request host

People (several per day) are getting to mozilla.org via URLs like
http://www.mozilla.org./en-US/grants/. This causes the HTTP_HOST
header to be 'www.mozilla.org.', which doesn't match Django's
ALLOWED_HOSTS, which then throws errors. Apache redirect people
coming to the site with a HOST that ends in a ".".
fix markup/layout bug on /dnt page
Merge pull request #781 from l-hedgehog/dnt-fix

fix markup/layout bug on /dnt page
Update speed.html
Merge pull request #771 from chrismore/patch-4

Bug 860848 - change update link
Merge pull request #790 from dpoirier/855734-domain-with-dot

Bug 855734 - Strip trailing "." from request host
Merge pull request #789 from icaaq/bug-861231-control-overlay-text

Bug 861231 - Add video control overlay descriptive text.