Upgrade path for maxmind geo data

Reference: https://github.com/cargomedia/fuboo/issues/2233

Original script and data: https://gist.github.com/njam/a0f3c19453f93eadab20

Use cases:
- Non-interactive db import during `cm.php app setup(?)`. Should download data from MaxMind.
- Additionally: Import from paid version of database.