Log Message:
Update to 3.31. From the changelog:

Fixed a bug in the scripts used to extract data from spreadsheets
that prevented the SHP currency code from being found.  RT 94229

Fixed a problem that was preventing rename_* functions to not work.
RT 92680.

Fixed the pod test files so that pod tests won't get run at install
time.  In response to RT 91167.

The alias_code function exists for backward compatibility.  It has been
deprecated since version 3.20 when it was replaced by rename_country_code.
The alias_code function will be removed in the December 2014 release.

ISO 3166 is now browsable online (previously, only the alpha-2 codes were)
and it contains more accurate information than the previous sources, so
I've switched to using the full standard.  In response to RT 92303 which
reported some codes being 'retired' that should not have been.