GeoIP lookup for SWI-Prolog

This library provides a minimal interface to the public GeoIP library from MAXMIND

It has been tested with the Ubuntu package libgeoip-dev with the databases from the package geoip-database-contrib, which are by default installed in =/usr/share/GeoIP=. A simple usage is:

?- tcp_host_to_address('www.swi-prolog.org', IP),
   geoip_lookup(IP, R).
R = geoip{city:'Amsterdam',
          continent_code:'EU',
          country_code:'NL',
          country_code3:'NLD',
          country_name:'Netherlands',
          latitude:52.349998474121094,
          longitude:4.9166998863220215,
          netmask:16,
          region:'07'}.

Installation

WARNING This installation will only work on a machine where libgeoip can be installed in a globally searched place and where C development tools are provided.

Install GeoIP library and database. The command for Ubuntu 14.04 is below.
```
sudo apt-get install geoip-database-contrib libgeoip-dev
```
Install the pack
```
?- pack_install(geopip).
```