Series description

This adds the container meta design to the series container, including the description. Hidden on mobile.

![screen shot 2014-08-11 at 16 10 40](https://cloud.githubusercontent.com/assets/4549425/3877870/d757bd5c-2169-11e4-9f56-cb10be80c041.png)
 
Should be before @include mq, as it's a property