* added direct access guard
* removed trailing `?>`
* in `get_post_types` function, changed argument `'public' => true` to `'show_ui' => true`

git-svn-id: https://plugins.svn.wordpress.org/im8-box-hide/trunk@833838 b8457f37-d9ea-0310-8a92-e5e31aec5664