es5-shim: use ECMAScript 5 in older browsers

ECMAScript 5 (ES5) brings with it some nice improvements. The only problem is that only newer browsers (Internet Explorer 9, Firefox 4, Chrome 5, Safari 5) support it, or at least its most interesting parts. es5-shim provides a neat solution: It checks for each ES5 feature whether it is present and if not, it provides its own implementation. As an aside: es5-shim originated as a Narwhal module