R1:20f7de91ceb5

Drive calendar event queries through the RRULE engine

Summary: Ref T10747. This drives event queries through RRULE, too.

Test Plan: Created recurring events, saw them appear correctly on the calendar.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10747

Differential Revision: https://secure.phabricator.com/D16668