misc/git: add gofmt git pre-commit hook
misc/git: add gofmt git pre-commit hook

R=golang-dev, bradfitz, ftrvxmtrx, franciscossouza, r, minux.ma
CC=golang-dev
http://codereview.appspot.com/6843044

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