Fronts: 'You might have missed...' card ab test

Test a card in the news container, which pulls in the 3 most read content over the last 24 hours, removing any the user has already visited (using the `history` module)

![screen shot 2014-03-05 at 11 39 25](https://f.cloud.github.com/assets/74132/2332613/dd00665a-a45a-11e3-9ef0-4059706d021c.jpeg)