Update for compatibility with 3.9.1

git-svn-id: https://plugins.svn.wordpress.org/auto-image-field/trunk@937056 b8457f37-d9ea-0310-8a92-e5e31aec5664
Screenshots not appear..

git-svn-id: https://plugins.svn.wordpress.org/auto-image-field/trunk@937057 b8457f37-d9ea-0310-8a92-e5e31aec5664