added Xcode tests; WIP implementing nextDate function — simple intervals and specific days of the week work.
added more tests; tried a simple approach to compute the next date but that didn’t work…
WIP: new impl. added more test cases;
another unsuccessful attempt…
WIP: another iteration
fixed a few BYMONTH with INTERVAL > 1 test cases which had wrong results.
minor fix; added a few more test cases
passing all tests!
added more tests; fixed a few issues;
code cleanup;
more tests + minor fixes
more tests & fixes;
more tests + fixes;
added "last wed" of the month test case; minor fix;
code cleanup
updated Readme