Bug 766606 - [mozilla.org] Firefox download button doesn't block new unsupported operating systems

* Copied the old platform detection code from download.js
* Added Windows 2000 (NT 5.0 and 5.0.1) detection
* Added Windows XP SP1 detection
Bug 892470 - enable plugincheck for ml, ro
Fix Bug 707493, Use latest add-ons manager screenshot
Merge pull request #1100 from ossreleasefeed/bug707493-use-updated-addond-manager-screenshot

Fix Bug 707493, Use latest add-ons manager screenshot
Bug 791681 - Insecure transition from HTTP to HTTPS in form post
[bug 898663] Add new fx os graphic to mobile page
Bug 895571 - Redirect to new donate_form
Merge pull request #1113 from dpoirier/bug-895571-restore-donation-file

Bug 895571 - Redirect to new donate_form
Bug 862842 - Update autoresponder email text & reply-to
Bug 897545 - Pass through the query parameters on the /firefox/ redirect
Merge pull request #1110 from kyoshino/bug-897545-fx-redirect-query

Bug 897545 - Pass through the query parameters on the /firefox/ redirect on www.mozilla.org
Merge pull request #1111 from alexgibson/bug-898663-add-new-fx-os-graphic-to-mobile

[bug 898663] Add new fx os graphic to mobile page
[bug 898024 898025] enable get phone cta for Venezuela and Columbia
Bug 862842 - Add Webmaker Mentor list signup to /contribute

When users sign up on https://mozilla.org/contribute and select "Education"
from the drop down list they should be subscribed to the Webmaker Mentor
mailing list. If they select any other interest, they should be subscribed
to the about:mozilla mailing list.
Merge pull request #1101 from jbuck/contribute2
Bug 897206 - Update en-US newsletter success message for new double opt-in process

When someone signs up for a newsletter in English, change the message
on the success page to say they'll have to confirm, just like any
other language.
Merge pull request #1118 from dpoirier/bug-897206-signup-success-message

Bug 897206 - Update en-US newsletter success message
Bug 799273 - [ro] Get Involved page, fix responsive design all locales

* Add email address
* Add 'ro' to LOCALES_WITH_MOZ15
* Add localized banner + css rule
* Fix CSS for slides 2 and 6
* Fix all localized rules (added .on class to be active only on the slideshow)
[fix bug 896961] Add base JS unit tests for bedrock global.js
Merge pull request #1107 from alexgibson/add-js-unit-tests-for-global-js

[fix bug 896961] Add base JS unit tests for bedrock global.js