Git commits in Moodle 2.3.1 by David Mudrák

commit 896f9ae83b3eb3ebe6b1feea4182610328d50aa5
Author: David Mudrák <david@moodle.com>
Date:   Tue, 26 Jun 2012 15:12:35 +0800
Tag:    v2.3.1

MDL-34019 Fix response item key name


commit d81d6ea2c3e792e32f59c6fb4a28cd608e03903e
Author: David Mudrák <david@moodle.com>
Date:   Fri, 22 Jun 2012 21:22:27 +0800
Tag:    v2.3.1

MDL-33453 Make it clear what search_references() and search_references_count() are good for