Upgrade to Version 1.4.0

git-svn-id: https://plugins.svn.wordpress.org/map-images/trunk@1032059 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated supported wordpress version

git-svn-id: https://plugins.svn.wordpress.org/map-images/trunk@1032060 b8457f37-d9ea-0310-8a92-e5e31aec5664