Git commits in Moodle 2.7.4 by Joshua Johnston

commit c5d0af083fd835a0118ebc225f3c7809f955bdee
Author: Joshua Johnston <jojohnston@kaplan.edu>
Date:   Tue, 12 Aug 2014 05:16:30 +0800
Tag:    v2.7.4

MDL-46651 Backup: Handle duplicate course completions during restore