geoip: deprecate geoip-lite for maxmind

* adds support for maxmind module
    * adds ASN lookups
    * compiles/installs faster
    * runs faster
* maintains compabibility with geoip-lite
* removes geoip-lite from package.json, speeding Haraka installs and Travis tests
* doesn't register hooks unless module require works & MaxMind DBs are present
* loads connect.geoip.ini in a new function with a callback
* adds script for d/l GeoIP dbs