Gallery lightbox


![image](https://cloud.githubusercontent.com/assets/960919/4253675/44c1c278-3aa3-11e4-897c-001e790bd98e.png)


finally
![image](http://media.giphy.com/media/UdqUo8xvEcvgA/giphy.gif)
this will start to fail the build when we/I turn on JSCS - https://github.com/guardian/frontend/pull/5853