Git commits in Moodle 2.3.x by Huy Hoang

commit 71ff0a2f85bf63dbd2f0ab7bc6cc9622f5182664
Author: Huy Hoang <hoang027@umn.edu>
Date:   Thu, 01 Nov 2012 17:14:45 +0800
Tag:    v2.3.4

MDL-34695 Wiki Module: add prevention to create new record when userid is 0