AUTHORS: remove Vega Garcia Luis Alfonso (covered by Google CLA)
AUTHORS: remove Vega Garcia Luis Alfonso (covered by Google CLA)

R=dsymonds, adg
CC=golang-dev
https://codereview.appspot.com/7180050

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang