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This week's Ruby Quiz is to write a simple utility.  Your program should accept
an IP address as a command-line argument and print out the two letter code for
the country that IP is assigned in.  You can find a database for the matching
at:

	http://software77.net/cgi-bin/ip-country/geo-ip.pl

To keep the problem interesting though, let's write our programs with a focus on
speed and memory efficiency.

	$ time ruby ip_to_country.rb 68.97.89.187
	US
	
	real    0m0.314s
	user    0m0.259s
	sys     0m0.053s