Git commits in Moodle 2.9.0 by Jordi Pujol Ahulló

commit d5f596589b4f6c4f2260afa70c6768a761be58cb
Author: Jordi Pujol Ahulló <jordi.pujol@urv.cat>
Date:   Tue, 24 Mar 2015 18:29:07 +0800
Tag:    v2.9.0-beta

MDL-49641 repository_dropbox: preventing poor performance.