install gulp to process code

node_modules/for-in/index.js

@@ -0,0 +1,16 @@
+/*!
+ * for-in <https://github.com/jonschlinkert/for-in>
+ *
+ * Copyright (c) 2014-2017, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+'use strict';
+
+module.exports = function forIn(obj, fn, thisArg) {
+  for (var key in obj) {
+    if (fn.call(thisArg, obj[key], key, obj) === false) {
+      break;
+    }
+  }
+};