Added a custom CSS setting.

git-svn-id: https://plugins.svn.wordpress.org/admin-classic-borders/trunk@815325 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changed Plugin URI to point to WordPress repository location.

git-svn-id: https://plugins.svn.wordpress.org/admin-classic-borders/trunk@815326 b8457f37-d9ea-0310-8a92-e5e31aec5664