Add count method to calendar that returns the amount of events.
Remove any events in the calendar that are out of the date range given, if the event registry does not use filters passed.
Autoload same namespaced classes in tests directory.
Update namespaces of Mock classes.
Calendar test to test event that falls within date range.
Allow extra filters to be passed when populating the calendar for use of the event registry.
Change populate method to allow limit to be null and take an extra array of filters.