lunar-ko-cache.el and lunar-ko-mdays.el are required for cal-korea-x.el It's possible to generate these files using rake(1), but it will require to build the Korean date database using ko-dump.rb and it may take time. Thus, for the convenience, these two files are registered in the repositry.
As the previous LDATESPEC, which is in (MONTH DAY YEAR LEAP) form is not used in the implementation, I decided to remove it. The only benefit of this form was, it looked similar to the DATE representation in the calendar, in (MONTH DAY YEAR).
Since the Chinese localized calendar support is from cal-china-x.el, and my implementation is from that file, I want to change my front-end file as cal-korea-x.el. See also http://www.emacswiki.org/emacs/CalendarLocalization