First version of a simple tool to get a list of the version a user first
contributed to.

Change-Id: I8f1b1fef5343de269c4b6209632c9cedc2cf1a37

This information is in git, so it's better to use that as a source than
updating this file manually. This script can be run manually at release
time for now, or we can set up a cron job sometime in the future.

Change-Id: I0344135ceb9c04ed14e2e2d939a93194e35973db