fix to work in node 4

Author: icebob

lib/helpers/flatten.js

@@ -1,3 +1,4 @@
+"use strict";
 
 /**
  * Flatten an array

lib/validator.js

@@ -26,10 +26,13 @@ function loadRules() {
  * 
  * @param {Object} opts 
  */
-function Validator(opts = {}) {
-	this.opts = deepExtend({
+function Validator(opts) {
+	this.opts = {
 		messages: defaultMessages
-	}, opts);
+	};
+
+	if (opts)
+		deepExtend(this.opts, opts);
 
 	this.messages = this.opts.messages;