App now runs properly on dev server in production mode

- Added line to production config to allow the static serving of assets. This should be disabled for real production servers like Apache or Nginx.
- Added script start the dev server (Thin currently) in production mode. Be sure to run `rake assets:precompile` before running, and run `rake assets:clean` before subsequently running the app in development mode, otherwise the precompiled javascript will send duplicate requests to the backend and cause the app to go haywire.