Add badge to primary nav dropdown

Also changes the link for /destinations

Not to be merged yet, has to wait for dispatch changes.

![image](https://cloud.githubusercontent.com/assets/814861/5458594/77cd6d00-854b-11e4-8eec-7478b3cef079.png)

Surely if we're applying our own focus styles it's acceptable? It stays tabbable. Keen to hear arguments though.