Add CSS minification, AJAX settings, and modern admin styling

admin/js/wpa-superstar-admin.js

@@ -2,11 +2,11 @@ jQuery(document).ready(function($) {
     $('.wpa-superstar-toggle input').on('change', function() {
         var option = $(this).attr('name');
         var value = $(this).is(':checked') ? 1 : 0;
-        $.post(ajaxurl, {
+        $.post(wpaSuperstar.ajaxurl, {
             action: 'wpa_superstar_update_option',
             option: option,
             value: value,
-            nonce: '<?php echo wp_create_nonce( "wpa-superstar-nonce" ); ?>'
+            nonce: wpaSuperstar.nonce
         }, function(response) {
             console.log(response);
         });