+ 4. The Easter calculation (function easter() in dateutilz.datetime_utils.py)
+ was copied directly with from the dateutil (pip install python-dateutil)
+ project in order to remove that dependency from this project.
+
+ Dateutil is an Apache 2.0 licensed open source project. The original
+ copyright for that code is reproduced above the stolen function.
+
+ Scott didn't do anything to this logic other than minor formatting changes.
+