Add support to xForwardedFor
Add support to xForwardedFor

- enabling trusted proxy in express
- make this option configurable by adding trustedProxy
  booleen  in the config file

lanchongyizu/on-http,larry-dean/on-http,lanchongyizu/on-http,keedya/on-http,RackHD/on-http,larry-dean/on-http,lanchongyizu/on-http,keedya/on-http,RackHD/on-http,keedya/on-http,larry-dean/on-http,larry-dean/on-http,RackHD/on-http,keedya/on-http,RackHD/on-http,lanchongyizu/on-http