release 3.1.0

git-svn-id: https://plugins.svn.wordpress.org/custom-menu-wizard/trunk@1001279 b8457f37-d9ea-0310-8a92-e5e31aec5664
release v3.1.0

git-svn-id: https://plugins.svn.wordpress.org/custom-menu-wizard/trunk@1001286 b8457f37-d9ea-0310-8a92-e5e31aec5664