codereview: do not send mail when submitting for others
codereview: do not send mail when submitting for others

rename original_author to copied_from so that it reads
better when used as a condition.

R=r
CC=golang-dev
http://codereview.appspot.com/185045

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go