Small design tweaks to fronts

Around round of little design changes across the fronts.

Before:
![screen shot 2014-10-10 at 20 09 33](https://cloud.githubusercontent.com/assets/1607666/4597710/e7b61a60-50b0-11e4-95b8-7a155e311865.png)

After:
![screen shot 2014-10-10 at 20 09 50](https://cloud.githubusercontent.com/assets/1607666/4597711/ea195e16-50b0-11e4-83b9-ce84828a2f8e.png)

Unfortunately we share `tone-colour` with the articles, where it's important to the page's styling. It also appears that we bring in the byline from the same piece of Scala so having two places where this comes from seems like a little too much.

I think the plan is to remove `tone-colour` from the article pages as well, then we can remove this.