Remove Modernizr script and add html5shiv and media query polyfill scripts for < IE9

Author: mmistakes

_includes/_head.html

@@ -40,8 +40,11 @@
 
 <meta http-equiv="cleartype" content="on">
 
-<!-- Load Modernizr -->
-<script src="{{ site.url }}/assets/js/vendor/modernizr-2.6.2.custom.min.js"></script>
+<!-- HTML5 Shiv and Media Query Support -->
+<!--[if lt IE 9]>
+	<script src="{{ site.url }}/assets/js/vendor/html5shiv.min.js"></script>
+	<script src="{{ site.url }}/assets/js/vendor/respond.min.js"></script>
+<![endif]-->
 
 <!-- Icons -->
 <!-- 16x16 -->