Git commits in Moodle 3.0.3 by Michael Aherne

commit 7f7b3c1b5be98ab713b30eb4e3a5c75137ba6349
Author: Michael Aherne <michael.aherne@strath.ac.uk>
Date:   Wed, 23 Dec 2015 00:01:06 +0800
Tag:    v3.0.3

MDL-52589 cache: Allow unused stores to be uninstalled