Git commits in Moodle 3.0.0 by David Balch

commit 9dcd50358ab5c22db30a817370d7c7265e4393bd
Author: David Balch <david.balch@conted.ox.ac.uk>
Date:   Wed, 15 Jul 2015 18:48:43 +0800
Tag:    v3.0.0-beta

MDL-50839 user_menu: Allow themes to set User menu avatar size.