CONTRIBUTORS: add Jonathan Nieder (Google CLA)
CONTRIBUTORS: add Jonathan Nieder (Google CLA)

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/7842043

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