Small stuff to make eslint happy

Gruntfile.js

@@ -130,7 +130,7 @@ module.exports = function(grunt) {
         "src/js/lib/vkbeautify.js",
         "src/js/lib/Sortable.js",
         "src/js/lib/bootstrap-colorpicker.js",
-        'src/js/lib/jquery.xpath.js',
+        "src/js/lib/jquery.xpath.js",
         
         // Custom libraries
         "src/js/lib/canvas_components.js",

src/js/operations/Extract.js

@@ -396,7 +396,7 @@ var Extract = {
         };
 
         return Array.apply(null, Array(result.length))
-            .map(function (_, i) {return result[i];})
+            .map((_, i) => result[i])
             .map(nodeToString)
             .join(delimiter);
     },