Country Config: Reads and writes country codes to XML files

This class is meant to read or write XML files with country codes and associated country name and other information.

It uses ianacclister class to build a country information listing as an associative array.

It also uses Config class to write the country information to a country-codes.xml file

The readConfiguration function reads from that file, returning an array keyed by country code with country name and country's whois lin.