Git commits in Moodle 2.9.3 by Jinu Abraham

commit 1d9eb4709d3f6c4056aa4e1a407e551726eff0b2
Author: Jinu Abraham <jinu.abraham@blackboard.com>
Date:   Mon, 31 Aug 2015 13:18:31 +0800
Tag:    v2.9.3

MDL-50483 gradereport_user: fix the fatal error of no enrolled users

commit 328732592e00f731744637a35f30749fbd1b82d0
Author: Jinu Abraham <jinu.abraham@blackboard.com>
Date:   Mon, 31 Aug 2015 10:34:01 +0800
Tag:    v2.9.3

MDL-51232 mod_book: Filter name header