'use strict' & surround build step cleanups.

Author: thgreasi

gruntFile.js

@@ -1,3 +1,5 @@
+/* jshint node:true */
+
 'use strict';
 
 module.exports = function(grunt) {
@@ -102,7 +104,8 @@ module.exports = function(grunt) {
 
     surround: {
       options: {
-        prepend: '(function(window, angular, undefined) { \'use strict\';',
+        prepend: ['(function(window, angular, undefined) {',
+                  '\'use strict\';'].join('\n'),
         append: '})(window, window.angular);'
       },
       main: {

src/sortable.js

@@ -8,8 +8,6 @@ angular.module('ui.sortable', [])
   .directive('uiSortable', [
     'uiSortableConfig', '$timeout', '$log',
     function(uiSortableConfig, $timeout, $log) {
-      'use strict';
-
       return {
         require: '?ngModel',
         link: function(scope, element, attrs, ngModel) {