Git commits in Moodle 2.5.1 by Michael Aherne

commit 3a4a5356eb391de8b19590e88ce6836a9afb8623
Author: Michael Aherne <michael.aherne@strath.ac.uk>
Date:   Fri, 21 Jun 2013 18:40:36 +0800
Tag:    v2.5.1

MDL-40275 core Improve documentation for block_base::has_config()