New port: textproc/py-iso3166: Standalone ISO 3166-1 country definitions

Self-contained ISO 3166-1 country definitions.

WWW: https://pypi.python.org/pypi/iso3166

First user: multimedia/streamlink

(kevans@ asked me to handle the commit on Sat May 30 via IRC,
I missed it, and he asked again today.)

PR: 241565
Submitted by: takefu@airport.fm (maintainer)
Reviewed by: koobs@, vvd@unislabs.com