Developer credits

Git commits in Moodle 2.5.2 by Henning Bostelmann

commit a15ad2be175ccbbca2e4a955c1db85a57e80d5b8
Author: Henning Bostelmann <henning.bostelmann@york.ac.uk>
Date:   Thu, 01 Aug 2013 19:43:12 +0800
Tag:    v2.5.2

MDL-27595 backup: allow course import with warnings Proceed with import if warnings are found, but display the warnings afterwards