added whole system from ola4doc

sys/node_modules/es5-ext/function/#/copy.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var mixin         = require('../../object/mixin')
+  , validFunction = require('../valid-function')
+
+  , re = /^\s*function\s*([\0-'\)-\uffff]+)*\s*\(([\0-\(\*-\uffff]*)\)\s*\{/;
+
+module.exports = function () {
+	var match = String(validFunction(this)).match(re), fn;
+
+	fn = new Function('fn', 'return function ' + match[1].trim() + '(' +
+		match[2] + ') { return fn.apply(this, arguments); };')(this);
+	try { mixin(fn, this); } catch (ignore) {}
+	return fn;
+};