Saucisson and New Features Container

- [new] Saucisson pattern: a single full-width item, with an image that takes 2 thirds of the horizontal space on tablet and up (Used as a skin for the first item in Features containers)
- [new] New Features Container (see screenshots)
- [new] Trying 

From now on, new containers/skins have a sell-by date. At which point we can assess whether we keep the container/skin for another X weeks or KILL THEM (duration TBD).

Note: if an editor uses the new features container but the switch is off, it defaults to the old features container

## Mobile

![screen shot 2014-05-21 at 17 12 05](https://cloud.githubusercontent.com/assets/85783/3043336/38ba97a4-e105-11e3-8918-d4dd21de9bb1.PNG)

## Tablet

![screen shot 2014-05-21 at 17 11 56](https://cloud.githubusercontent.com/assets/85783/3043337/3bb682ce-e105-11e3-9f3e-c48edea1dc80.PNG)

## Desktop

![screen shot 2014-05-21 at 17 11 49](https://cloud.githubusercontent.com/assets/85783/3043338/40754a2a-e105-11e3-83a1-0612d6c1a7ae.PNG)

![ ](http://media.giphy.com/media/899rXpPrpJ4c0/giphy.gif)