Git commits in Moodle 2.5.3 by Dongsheng Cai

commit 1027fd95bd200d374dabd5680e8aeb4771a4ce96
Author: Dongsheng Cai <dongsheng@moodle.com>
Date:   Wed, 18 Sep 2013 01:04:37 +0800
Tag:    v2.5.3

MDL-41843 Uses OAuthException in moodle\mod\lti namespace