Use protocol agnostic asset URLS

Closes #5

template.html

@@ -5,13 +5,13 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>Feature comparison of Perl 6 compilers</title>
-    <link href="http://perl6.org/favicon.ico" rel="shortcut icon"
+    <link href="//perl6.org/favicon.ico" rel="shortcut icon"
         type="image/x-icon">
-    <link href="http://perl6.org/bootstrap/css/bootstrap.min.css"
+    <link href="//perl6.org/bootstrap/css/bootstrap.min.css"
         rel="stylesheet">
-    <link href="http://perl6.org/bootstrap/css/bootstrap-theme.min.css"
+    <link href="//perl6.org/bootstrap/css/bootstrap-theme.min.css"
         rel="stylesheet">
-    <link href="http://perl6.org/style.css" rel="stylesheet">
+    <link href="//perl6.org/style.css" rel="stylesheet">
     <style>
         .implemented, .implemented a {
             background-color: #3c3;
@@ -257,8 +257,8 @@ <h4><a href="http://perl6.org/specification/">Language Design</a></h4>
   </div>
 </footer>
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-<script src="http://perl6.org/bootstrap/js/bootstrap.min.js"></script>
-<script src="http://perl6.org/js.js"></script>
+<script src="//perl6.org/bootstrap/js/bootstrap.min.js"></script>
+<script src="//perl6.org/js.js"></script>
 
 </body>
 </html>