Small changes

git-svn-id: https://plugins.svn.wordpress.org/display-registered-image-dimensions/trunk@836848 b8457f37-d9ea-0310-8a92-e5e31aec5664
small changes to assets

git-svn-id: https://plugins.svn.wordpress.org/display-registered-image-dimensions/trunk@836850 b8457f37-d9ea-0310-8a92-e5e31aec5664