Project: moodle
Issue MDL-43293: Events for comments
Create events for comments in all module, where comments are used. FYI: Comment abstract class has been included in MDL-40058. Please fill https://docs.google.com/spreadsheet/ccc?key=0As79sf2a3WehdDRMTTNWaHdwVm5BQW95eDc2OFV6TGc&usp=sharing while you are creating new events.
Story points: 20