Slim Head CSS

- [new] Get rid of Zone colours (only the "most read" fallback page was using them)
- [new] Unify head so that default, identity and facia inline CSS use the same base
- [new] Identity and Facia pages don't load article layout, typographic styles and social widgets

## Weight gains

Left: before
Right: after

![screen shot 2013-11-07 at 18 36 34](https://f.cloud.github.com/assets/85783/1494431/26e56594-47dc-11e3-9f8c-dbdf0979ed59.PNG)

![ ](http://s2.developerslife.ru/public/images/gifs/9822336b-b993-4ece-be89-9cc8b91422ad.gif)