npm update
[Modify][auth.js] config new amazon key&secret
[Modify] require auth-service to check if user isLoggedIn
[Modify][login.js] ask Facebook for more permission and remove unused code
Minor changes
[Modify][create_trip.js] add auth-service.js and implement the private authen part
[Modify][aws-s3.js] redesign image path
[Modify][proxy.js] add io.socket