Fixed a minor conflict with WooCommerce 2.1.12 where AME would not be able to change permissions for certain "Products" submenus.

Apparently some parts of WooCommerce use "&amp;" (the HTML entity) to separate query parameters instead of the usual "&". This throws off the algorithm that AME uses to determine the current page. Fixed by automatically converting &amp; to & when generating page URLs.

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-editor/trunk@973088 b8457f37-d9ea-0310-8a92-e5e31aec5664