Data sources for `countries.json` and `continents.json`:

 * https://github.com/annexare/Countries
 * https://raw.githubusercontent.com/annexare/Countries/master/data/continents.json
 * https://raw.githubusercontent.com/annexare/Countries/master/data/countries.json

The `munge_country_data.pl` script processes the source JSON to a combined JSON data structure `data.json` for the `cli_demo.pl` script in the parent directory.
