interfaces: Make User.ID optional, and add IP
interfaces: Make User.ID optional, and add IP

bigdrum/raven-go,DramaFever/raven-go,DramaFever/raven-go,getsentry/raven-go,getsentry/raven-go,bigdrum/raven-go,mpuncel/raven-go,mpuncel/raven-go