provided option to use x-forwarded-for as remote address [updated]

Providing the option to use X-Forwarded-For as remote client's ip address can be very useful when hapi serves behind nginx or a load balancing web server. It makes more sense to record the 'true' remote ip instead of the proxy server's ip in that kind of scenario.
Under `remoteAddress`, you can add `forwardedFor` and set it to `req.headers['x-forwarded-for']` Then you don't need the extra option.