Added the RDate iterator. Currently untested.
Don't like the 'unit' directory name.
Fixed unittests.
Testing RDate.
Testing RDate.
More RDATE tests.

Fixes #51.
Updated changelog.
This hopefully fixes hhvm.
Extra semi-colon
Fast finish on =)
Add a few periods.
Merge pull request #107 from fruux/rdate-support

Rdate support