Git commits in Moodle 2.9.0 by Sergey Rozhkov

commit f1e1477142c8c55c8ef7c5f0578206f55ce66a8e
Author: Sergey Rozhkov <progger007@gmail.com>
Date:   Sun, 29 Mar 2015 04:41:33 +0800
Tag:    v2.9.0-beta

MDL-37864 lib: Help icon work correctly in table header with sorting