Git commits in Moodle 2.4.11 by Rex Lorenzo

commit a5abafcde27764a2e9f4ae3a7ed30b60f2546268
Author: Rex Lorenzo <rex@oid.ucla.edu>
Date:   Sat, 17 May 2014 06:26:25 +0800
Tag:    v2.4.11

MDL-45485 auth_shibboleth: User taking over other user's session