Git commits in Moodle 2.3.x by Mohamed Alsharaf

commit dc7d68880a7204682b0516d56340e52a576eb7f8
Author: Mohamed Alsharaf <mohamed.alsharaf@gmail.com>
Date:   Wed, 12 Jun 2013 07:54:42 +0800
Tag:    v2.3.8

MDL-40091 book: revision must be incremented after editing a chapter