Git commits in Moodle 2.6.0 by John Beedell

commit 614bf85a9e2b8c1cf62e36e713c883faaadeb5b2
Author: John Beedell <j.beedell@open.ac.uk>
Date:   Thu, 24 Oct 2013 20:31:52 +0800
Tag:    v2.6.0-rc1

MDL-41473 book: Book html zip import, incorrect url produced for internal linking to other chapters