Git commits in Moodle 3.0.0 by Lars Anderson

commit 2be327dca9ea2b35bbc40684b65e27e16dcc64fb
Author: Lars Anderson <lsa@its.aau.dk>
Date:   Wed, 25 Mar 2015 22:29:44 +0800
Tag:    v3.0.0-beta

MDL-49561 core_calendar: Fix ical export for events with no duration