Git commits in Moodle 3.2.1 by Davo Smith

commit 31e4c05002d098f640b042f09440f2c44df48eb4
Author: Davo Smith <git@davosmith.co.uk>
Date:   Thu, 16 Oct 2014 19:52:31 +0800
Tag:    v3.2.1

MDL-47198 filelib: fix curl handling headers with no value