Author: Frederic Massart
MDL-32746 core: Implement new user_loggedin event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3b086e309485d1050fc8c103313db2206f829a5d
http://github.com/moodle/moodle/commit/3b086e309485d1050fc8c103313db2206f829a5d
+ 2.6 en [event_user_loggedin,core_auth]
+ 2.6 en [event_user_loggedin_desc,core_auth]