Define rootUrl in js_include

So /localize is working not matter which alias we use, even on the front page

public/js/vroom.js

@@ -35,7 +35,7 @@ var locale = {
 
 // Localize the strings we need
 $.ajax({
-  url: '/localize',
+  url: rootUrl + 'localize',
   type: 'POST',
   dataType: 'json',
   data: {

templates/default/join.html.ep

@@ -162,11 +162,6 @@
     </div>
 %= include 'js_include'
     <script>
-      <%
-        my $url = $self->url_for('/');
-        $url .= ($url =~ m/\/$/) ? '' : '/';
-      %>
-      var rootUrl = '<%= $url %>';
       var roomName = '<%= $room %>';
       $( document ).ready(function() {
         webrtc = new SimpleWebRTC({

templates/default/js_include.html.ep

@@ -1,3 +1,10 @@
+    <script type="text/javascript">
+      <%
+        my $url = $self->url_for('/');
+        $url .= ($url =~ m/\/$/) ? '' : '/';
+      %>
+      var rootUrl = '<%= $url %>';
+    </script>
     <script type="text/javascript" src="/js/simplewebrtc.bundle.js"></script>
     <script type="text/javascript" src="/js/jquery-1.11.1.min.js"></script>
     <script type="text/javascript" src="/js/bootstrap.min.js"></script>