- Modified update-holidays.pl script to include the MIT license.
- Added the URLs used to download the data, in the data.
- Added a refresh script to freshen the files.
- Renamed all holiday files to include a locale, rather than just
a country code.
- Enhanced update-holidays.pl add-on script to support regions,
provide better error handling, error on missing Perl module,
warnings on unavailable data, and help text.
- Updated documentation accordingly.