gmarik: step 5, submit a contrib
gmarik: step 5, submit a contrib

- contrib workshop

Change-Id: I65119e1af5b50f6711703a91d9b17bc1103a0382
Reviewed-on: https://go-review.googlesource.com/48602
Reviewed-by: Kevin Burke <685caccd7011cfe58b8f9ef79ff9dca388f03c79@inburke.com>

golang/scratch