Deprecation Notice and Proper Role Names

I've changed get_current_theme() to wp_get_theme() to remove deprecation notice if WP_DEBUG is set to true.

Also, I've modified the method used to retrieve the role name so it actually pulls in the correct name. I will sometimes modify the default role names, but not the role itself, so the wrong name was appearing. This is also helpful if anyone creates a role where the name differs form the role itself.