Add the version number in the release note page.

1) This will simplify the life of some our users, sysadmins and developers:
https://bugzilla.mozilla.org/show_bug.cgi?id=973335
2) We are already showing them here: https://www.mozilla.org/en-US/firefox/releases/
3) We are using the numbers everywhere, the press is doing the same.
4) The version is available in the URL
Bug 1048586 - add photo gallery to Sweden community page
Merge pull request #2212 from sylvestre/master

Add the version number in the release note page.
Merge pull request #2218 from craigcook/bug-1048586-sweden-photo-gallery

Bug 1048586 - add photo gallery to Sweden community page
[fix bug 1050284] Update ARIA on <svg> elements in firefox/desktop intro
Bug 1052166 - Add tests for grants_db.py
Merge pull request #2220 from jbuck/test-grants

Bug 1052166 - Add tests for grants_db.py
Merge pull request #2222 from alexgibson/bug-1050284-update-aria-svg-elements-firefox-desktop

[fix bug 1050284] Update ARIA on <svg> elements in firefox/desktop intro
[bug 1016500] Fix image rotation on manifesto page
Merge pull request #2224 from alexgibson/bug-1016500-fix-image-rotate-manifesto-page

[bug 1016500] Fix image rotation on manifesto page
[no bug] Add grunt task to remove generated less.css files for development
Merge pull request #2225 from alexgibson/add-grunt-clean-task

[no bug] Add grunt task to remove generated less.css files for development
Bug 1047569 - add two new links on /about page
[fix bug 1051686] l10n: ja add redirection rule for ja/firefox/origanizations
Merge pull request #2227 from alexgibson/bug-1051686-add-direction-rule-ja-firefox-origanizations

[fix bug 1051686] l10n: ja add redirection rule for ja/firefox/origanizations
Merge pull request #2223 from retornam/bug-1047569-add-two

Bug 1047569 - add two new links on /about page
Bug 1047569 - Use single tag for all new strings on /about page
Merge pull request #2228 from flodolo/bug1047569

Bug 1047569 - Use single tag for all new strings on /about page
Bug 1047569 - remove a trailing period
Merge pull request #2229 from TheoChevalier/bug1047569-followup

Bug 1047569 - remove a trailing period