Git commits in Moodle 2.5.x by Mike Churchward

commit d750d41e66583ce2b10decc5c6f7bde9cecf724d
Author: Mike Churchward <mike@remote-learner.net>
Date:   Wed, 17 Apr 2013 22:48:32 +0800
Tag:    v2.5.0-rc1

MDL-34933 core_message: Adding index to improve database access on message_working table.