Git commits in Moodle 2.7.10 by Petr Skoda

commit 6e8224365ffcdf328458ea7852dc62574e806119
Author: Petr Skoda <petr.skoda@totaralms.com>
Date:   Wed, 19 Aug 2015 05:33:12 +0800
Tag:    v2.7.10

MDL-50860 core: improve creation of random strings