Author: Simey Lameze
MDL-59750 core_calendar: better handling of event subscription
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8afe9f8a1484b55e444a3704e3f56adb30315044
http://github.com/moodle/moodle/commit/8afe9f8a1484b55e444a3704e3f56adb30315044
+ 3.4 en [subscriptionsource,core_calendar]