Added a simple AA test to the application
Whitespace fixes
Add a switch for the A/A test
Tidy up the A/A test conventions
Remove the doc
Make non-participating users distinct from the control group
Fixed test ID
Merge branch 'master' of https://github.com/guardian/frontend into aa-test

Conflicts:
	common/app/assets/javascripts/modules/experiments/tests/aa.js
Merge pull request #1152 from guardian/aa-test

A/A test