Tonal component

Adds tonal facia components to the footer of content within those tones.

- Refactors facia JSON controller to output new containers based on type
- Refactors facia-layout--article CSS to accept new container types
- Add JS tonal-component

### Feature container
![google chrome](https://cloud.githubusercontent.com/assets/80089/2682125/3eb901c4-c196-11e3-9b20-5431896b9152.png)

### Comment and debate container
![google chrome](https://cloud.githubusercontent.com/assets/80089/2682127/41331052-c196-11e3-8de0-ed7b083b339e.png)