Added ISO 3166 countries 

Added the ability to generate ISO 3166 coutries. (England, Wales, Scottland, N Ireland are not countries according to that spec, they're all alpha-2 "GB" or "United Kingdom") 

List as found at: http://en.wikipedia.org/wiki/ISO_3166-2#Current_codes

Interesting video regarding Great Britain, UK, England etc.. https://www.youtube.com/watch?v=rNu8XDBSn10