compatibility test against WordPress 3.9

git-svn-id: https://plugins.svn.wordpress.org/m-retina-gravatars/trunk@900733 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tested against WordPress 3.9

git-svn-id: https://plugins.svn.wordpress.org/m-retina-gravatars/trunk@900734 b8457f37-d9ea-0310-8a92-e5e31aec5664