Git commits in Moodle 2.8.4 by Botond Hegedus

commit dac942ff58844ac35094ac7dd3cad402865a4f71
Author: Botond Hegedus <botondhegedus.webdeveloper@gmail.com>
Date:   Sun, 15 Feb 2015 20:33:37 +0800
Tag:    v2.8.4

MDL-49198 core_webservice: Fix error when using existing service name