Adding v1.3.0 changes

git-svn-id: https://plugins.svn.wordpress.org/wp-nested-pages/trunk@1055086 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating stable to 1.3.0

git-svn-id: https://plugins.svn.wordpress.org/wp-nested-pages/trunk@1055088 b8457f37-d9ea-0310-8a92-e5e31aec5664