Git commits in Moodle 2.8.9 by Simey Lameze

commit 2ecb8fdea75e1d37afa6721f4a961dbd93eee6f5
Author: Simey Lameze <simey@moodle.com>
Date:   Mon, 19 Oct 2015 09:15:22 +0800
Tag:    v2.8.9

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

commit b4f4232e1cf76334e4b8dda9cf68962b121e6bc0
Author: Simey Lameze <simey@moodle.com>
Date:   Thu, 24 Sep 2015 08:42:38 +0800
Tag:    v2.8.9

MDL-49940 mod_survey: Fix XSS on survey module

commit e1efcbd1db51b120b8cab1f61a2ec9e04cb56d56
Author: Simey Lameze <simey@moodle.com>
Date:   Thu, 17 Sep 2015 08:36:20 +0800
Tag:    v2.8.9

MDL-50959 gradebook: fix XML grade export

commit dcb42c9ed13b0c0ec2dde22b62ef69772d7725e6
Author: Simey Lameze <simey@moodle.com>
Date:   Mon, 14 Sep 2015 09:23:37 +0800
Tag:    v2.8.9

MDL-48109 mod_lesson: prevent CSRF on lesson

commit 6deeba6bccfbba8845bf6380b65de0b23c493bdf
Author: Simey Lameze <simey@moodle.com>
Date:   Tue, 08 Sep 2015 11:40:22 +0800
Tag:    v2.8.9

MDL-50959 gradebook: fix XML grade publishing score

commit 59d26c45d9fc61601fc79257da668e5842297786
Author: Simey Lameze <simey@moodle.com>
Date:   Wed, 02 Sep 2015 11:20:27 +0800
Tag:    v2.8.9

MDL-50884 auth_shibboleth: fix logout handler url generation