Git commits in Moodle 2.7.6 by Jetha Chan

commit 3be4c8751c94514e8918b3fbc5c5a6b7bcca64ff
Author: Jetha Chan <jetha@moodle.com>
Date:   Fri, 06 Feb 2015 16:54:29 +0800
Tag:    v2.7.6

MDL-36009 grader_gradereport: filler and extra user cells should not be headers

commit 3ba01c11b4fb6e4791539830ebc7f9e56df1b274
Author: Jetha Chan <jetha@moodle.com>
Date:   Tue, 03 Feb 2015 17:37:30 +0800
Tag:    v2.7.6

MDL-49073 timezones: update to 2015a (2323 rules)