Update to 0.3600

Upstream changes:
0.3600 2015-11-11
- move t/22intersects.t to DT::Event::Recurrence module

0.3500 2015-11-10
- [rt.cpan.org #108633] Recurrent event does not intersect indefinite future,
  test contributed by Brett Watson.
- documentation - intersects() returns 0 for false, and 'undef' for
  undecidable.

(wen)