Make the header blue

- edition switch moved to the right, and subscribe out of ‘more’
- new, single style of pop up menus
- new and larger icons
- new colours
- services links moved into mega nav
- smoother meganav open/close animation 

![screen shot 2014-08-05 at 11 03 47](https://cloud.githubusercontent.com/assets/867233/3809780/1077a75a-1c88-11e4-8938-6aec1f5688ad.png)

:point_down: 

![screen shot 2014-08-05 at 11 02 55](https://cloud.githubusercontent.com/assets/867233/3809782/135f2344-1c88-11e4-9825-7c208ef4ad20.png)


yeah you’re right — `role=“navigation”` is absent from top bar and should not be. i’ll add that as a new PR.

re ul/div - I keep vacillating between an empty `div` being more/no more meaningless than an empty `ul`. It’s a good question. the `ul` obviously expresses the potential of a list in a way a div does not, but is more meaningful if it *is* absent?

that all said, I think it makes a lot of sense to add a `<ul role=“navigation” />` to a `<div />` if it’s adding a nav, like you say. i’ll revert this change in the same PR.