Security enhancements. Allow only valid characters for html class.

Update plugin URL.

git-svn-id: https://plugins.svn.wordpress.org/better-menu-widget/trunk@945196 b8457f37-d9ea-0310-8a92-e5e31aec5664
Security enhancements. Allow only valid characters for html class.

Update plugin URL.

git-svn-id: https://plugins.svn.wordpress.org/better-menu-widget/trunk@945198 b8457f37-d9ea-0310-8a92-e5e31aec5664