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Merge pull request #595 from scraperwiki/trial-expired

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Merge pull request #587 from scraperwiki/update-express

Upgrade to express 4
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
Enable 404 unit test