remove html5shiv to support legacy IE versions (#572)

Author: srprash

packages/core/doc-src/templates/layout.tmpl

@@ -6,9 +6,7 @@
 
     <script src="scripts/prettify/prettify.js"> </script>
     <script src="scripts/prettify/lang-css.js"> </script>
-    <!--[if lt IE 9]>
-      <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
-    <![endif]-->
+    
     <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
     <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
 </head>