Git commits in Moodle 2.7.3 by zbdd

commit 5d39d47ab6008c08059158aaf190a8ef32ea9b42
Author: zbdd <zdurber@gmail.com>
Date:   Fri, 29 Aug 2014 10:19:37 +0800
Tag:    v2.7.3

MDL-42993 auth: spaces removed from usernames by default only