Author: David Mudrak
MDL-25660 workshop registers events in the calendar
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6c6042404a0cb2ece02b236b2f5378b0811fb2f0
http://github.com/moodle/moodle/commit/6c6042404a0cb2ece02b236b2f5378b0811fb2f0
+ 2.2 en [assessmentendevent,mod_workshop]
+ 2.2 en [assessmentstartevent,mod_workshop]
+ 2.2 en [submissionendevent,mod_workshop]
+ 2.2 en [submissionstartevent,mod_workshop]