Add geoip csv file export, in the same format as MaxMind.
This might be useful for building debians geoip-database package from
alternate data sources.

Also adds experimental geoip asnum csv file export.
This might be useful for extending debians geoip-database package to
support building a geoip asnum database.
Merge pull request #79 from aagbsn/feature/add_export_geoip

Feature/add export geoip