Configured fronts now understand editionalised urls

You can now us urls like the following...

/uk-edition
/us-edition
/culture/au-edition
Merge branch 'master' of github.com:guardian/frontend into dotcom
Speech bubbles keep their appearance when JS is disabled or comment count fails to load in
Header is centered in IE10
HTML entities are escaped in discussion's article title
Hook up the test mode authentication.
now have desktop ads
Merge pull request #1064 from guardian/ad-desktop-width

Now have desktop ads
Merge pull request #1059 from guardian/discussion-page-escape-heading

HTML entities are escaped in discussion's article title
Merge pull request #1062 from guardian/speech-bubbles-appearance-fix

Speech bubbles keep their appearance when JS is disabled or comment count fails to load in
Merge pull request #1061 from guardian/ie10-header-center

Header is centered in IE10
Merge pull request #1063 from guardian/fix-tests-needing-authentication

Hook up the test mode authentication.
Byline and content have a space between them on landscape tablets
how to run an ab test
Update ab-testing.md
Update ab-testing.md
Merge branch 'master' of https://github.com/guardian/frontend into ab-test-docs
Merge branch 'ab-test-docs' of https://github.com/guardian/frontend into ab-test-docs
Example hypothesis and 'why not optimizely?'
Typos