Allowed Geo::IP as well as Geo::IP::PurePerl; Un-hardcoded the GeoIP.dat location;

Not sure if it's the best way of achieving this, but I think it works...
Merge pull request #34 from jesusbagpuss/patch-1

Allowed Geo::IP as well as Geo::IP::PurePerl; Un-hardcoded the GeoIP.dat...