Add unittests for geoip database version
Add to the report the geoip database version

This implements: https://trac.torproject.org/projects/tor/ticket/12771
Add details on how to contribute to the README.md

This closes https://trac.torproject.org/projects/tor/ticket/11980
Merge pull request #340 from TheTorProject/feature/12771

Feature/12771
Probe Report should not leak the full PATH.

This fixes: https://trac.torproject.org/projects/tor/ticket/12706