Update code to use theme_user_admin_perm

Creating an issue to hold some information regarding how I am changing the core of the way this module works.
The first release was 100% jQuery code completing the necessary manipulation to make it work. While that is a valid solution, I'd prefer this was in a more proper "Drupal-ish" way using theme override, and such.

With that in mind, I've set up this version I'm about to release to use less jQuery (although it is and always will be required), and use hook_theme_registry_alter() and theme_user_admin_perm() to manipulate the majority of the table cell and row on the server side, rather through DOM manipulation after the fact.

Really just to clean up the code a bit, and make it a more "real" Drupal module.

New version including these changes will be committed shortly.