Git commits in Moodle 2.5.3 by Sam Chaffee

commit d565223abdda20976f8b581ee911e65233086316
Author: Sam Chaffee <sam@moodlerooms.com>
Date:   Tue, 08 Oct 2013 02:33:52 +0800
Tag:    v2.5.3

MDL-40531 mod_lti: Changed namespace in XML to IMS LTI compliant

commit 5deb021566f405f8dca2f357af0717100db0898c
Author: Sam Chaffee <sam@moodlerooms.com>
Date:   Tue, 01 Oct 2013 04:43:52 +0800
Tag:    v2.5.3

MDL-42065 core_grade: Modified some grade_item queries for improved performance