rogpeppe: new command
rogpeppe: new command

This will be very useful.

Change-Id: Ib084b7fdee7cab2c27bfc45392f463bb5d703732
Reviewed-on: https://go-review.googlesource.com/48788
Reviewed-by: roger peppe <4e317290bbb82623ece0bfb0548ac21ebd5b23f1@gmail.com>

golang/scratch