Update site from bootstrap 2.1.1 to 3.3.5

docs/templates/shared/_head.liquid

@@ -1,12 +1,15 @@
 <head>
-  <meta charset=UTF-8>
+  <meta charset="utf-8">
   <title>{{headline}}</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
   <link rel="stylesheet" href="{{root}}/bootstrap/css/bootstrap.css" type="text/css">
   <link rel="stylesheet" href="{{root}}/css/base.css" type="text/css">
-  <!--[if IE]>
-    <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
+  <!--[if lt IE 9]>
+    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
+    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
   <![endif]-->
-  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
+  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
   <script src="{{root}}/bootstrap/js/bootstrap.js"></script>
-
-</head>
+  <script src="{{root}}/js/bootstrap3-typeahead.js"></script>
+</head>