Also follow the "go generate" convention, and have the generation
command be a bare "go run gen.go" without any need for explicit flags.

Stripping the for-debugging comments shrinks the generated table.go file
from 538K to 139K.

Also update table to latest list from publicsuffix.org:
revision ea9f4f9c51f5bfc5c85a41a5637ab671c07c542a
(2016-05-31T18:30:56Z)

Change-Id: Ib59366106e0142fd65a2102e73d6a9a29e53930e
Reviewed-on: https://go-review.googlesource.com/23930Reviewed-by: Andrew Gerrand <adg@golang.org>