Minor updates and tested up to WP 4.0

git-svn-id: https://plugins.svn.wordpress.org/custom-featured-image-metabox/trunk@987126 b8457f37-d9ea-0310-8a92-e5e31aec5664
Bump the version

git-svn-id: https://plugins.svn.wordpress.org/custom-featured-image-metabox/trunk@987130 b8457f37-d9ea-0310-8a92-e5e31aec5664