Git commits in Moodle 2.6.6 by Mark Nielsen

commit 5e04ac32014cfbe58fd0301b7fe918154f10901c
Author: Mark Nielsen <mark@moodlerooms.com>
Date:   Wed, 08 Oct 2014 02:48:35 +0800
Tag:    v2.6.6

MDL-47569 backup: Do not close questions tag if never opened

commit b0b22030a9678e10f520266259000ad8f66eb149
Author: Mark Nielsen <mark@moodlerooms.com>
Date:   Wed, 08 Oct 2014 02:47:40 +0800
Tag:    v2.6.6

MDL-47569 backup: Escape section summary for XML