Fronts network front

Fleshed out the networks fronts with the masthead component, and squished news to the right.

Renamed `trailblock` and `trail` to `collection` and `item` 

Played about with how to `extend` in a media query 

![facia](https://f.cloud.github.com/assets/74132/1009712/2b325bf6-0b3d-11e3-8f3c-dd1010a9fa5e.png)