Git commits in Moodle 2.6.7 by Simey Lameze

commit b270bb0d75d2354b7fbf4b8ccf0b995037973684
Author: Simey Lameze <simey@moodle.com>
Date:   Mon, 08 Dec 2014 14:37:57 +0800
Tag:    v2.6.7

MDL-48368 course: fix xss on course request pending page

commit ae4a17183a8db0089f28797c7f2e8daf64689750
Author: Simey Lameze <simey@moodle.com>
Date:   Fri, 14 Nov 2014 16:11:11 +0800
Tag:    v2.6.7

MDL-48017 core_calendar: add context validation to get_calendar_events

commit 371d58d70d4ef866f35e33ea6898007112bfe654
Author: Simey Lameze <simey@moodle.com>
Date:   Tue, 11 Nov 2014 09:33:35 +0800
Tag:    v2.6.7

MDL-47964 auth_shibboleth: Fix DOS on the shibboleth logout