Author: Rajesh Taneja
MDL-40043 Events API: Added user_loggedinas event to replace add_to_log
http://git.moodle.org/gw?p=moodle.git;a=commit;h=71298fea033dd9c3425c317d59a36b080cc29b0a
http://github.com/moodle/moodle/commit/71298fea033dd9c3425c317d59a36b080cc29b0a
+ 2.6 en [eventuserloggedinas,core_auth]