Fix mocha for coffee 1.7 (visionmedia/mocha#1120)
Prevent 404's from being returned as 200s
Move routes into /shared/
Fix for routing difference of backbone and express

Express matches "/url/" against its routes, whereas backbone
is "url/", i.e, no leading slash. So we insert it when using
the routes.
Add pretty 404 response page
Fix 404 route, move authenticated API onto its own router
Fix language of 404 page