Pull out browser shims.

We do not include shims into the browserified version from now on. For support
of oldIEs and other prehistoric browsers one might use [es5-shims][1]. See demo.

[1]: https://github.com/kriskowal/es5-shim

README.md

@@ -69,6 +69,10 @@ var doc = jsyaml.load('greeting: hello\nname: world');
 Browser support is still buggy, and mostly done to run online demo. If you
 can help to improve browser compatibility and AMD support - rise pull request.
 
+**Support of oldIEs** and some other prehistoric browsers is possible using
+[es5-shims](https://github.com/kriskowal/es5-shim). Just include shims before
+jsyaml to use it with outdated browsers.
+
 
 ## API
 

demo/index.html

@@ -8,6 +8,7 @@
     <link rel="stylesheet" href="css/codemirror.css">
     <link rel="stylesheet" href="css/codemirror.default.css">
     <link rel="stylesheet" href="css/demo.css">
+    <script src="js/es5-shims.js"></script>
     <script src="js/js-yaml.js"></script>
     <script src="js/codemirror.js"></script>
     <script src="js/codemirror/yaml.js"></script>