guardian/frontend — pull request #2659 by rich-nguyen (2014-01-03 15:59:23+00:00)
Title: Add ab test participation links

Easy to use links for one and all.

![screenshot from 2014-01-03 15 58 12](https://f.cloud.github.com/assets/4549425/1840319/017bfb02-7490-11e3-8798-aa47991b4289.png)