[#6] using express-cdn to push up any changed assets and bind correct urls

- Changed config files, added setup/config.js replacing env variables
- Fixed MongoHQ support
- Added support for CDN

!!! Need to check with js / css files
!!! Need to make sure policy works so anything uploaded is public
Merge pull request #10 from alexloi/6-push-assets-cdn

[#6] using express-cdn to push up any changed assets and bind correct ur...