Fixed: human readable error is only sent to browser. Status code is properly sent along when a template is rendered.
Changed: proxy error background color to darkblue to be less scary
Fix: PR comment about next
Merge https://github.com/jsilvestre/cozy-proxy

Conflicts:
	build/server/lib/proxy.js
	build/server/middlewares/errors.js
	server/lib/proxy.coffee
Fixed: human readable error is only sent to browser. Status code is properly sent along when a template is rendered.
Fix: PR comment about next