hierarchical post type support

git-svn-id: https://plugins.svn.wordpress.org/be-subpages-widget/trunk@801184 b8457f37-d9ea-0310-8a92-e5e31aec5664
update comment

git-svn-id: https://plugins.svn.wordpress.org/be-subpages-widget/trunk@801185 b8457f37-d9ea-0310-8a92-e5e31aec5664