Geocoding new requests

[deadroxy]

• Create MaxMind dev account
• Add MaxMind license key to .env
• Update README with instructions for devs
• Download GeoLite2 City database
• Configure Ahoy geocoding to use local MaxMindDB
• Display city/region/country info on all 4 record types
• Build wget/curl rake task to refresh MaxMindDB twice weekly
• Push geocoding to production
• Add MaxMindDB refresh task to Heroku scheduler
• Consider one time task to geocode IP data gathered after Phase 1