Add renderer guess in example shared file

& use it in every example.

examples/overlay.js

@@ -1,6 +1,5 @@
 goog.require('ol.Map');
 goog.require('ol.Overlay');
-goog.require('ol.RendererHints');
 goog.require('ol.View2D');
 goog.require('ol.coordinate');
 goog.require('ol.layer.Tile');
@@ -14,7 +13,7 @@ var layer = new ol.layer.Tile({
 
 var map = new ol.Map({
   layers: [layer],
-  renderer: ol.RendererHints.createFromQueryData(),
+  renderer: exampleNS.getRendererFromQueryString(),
   target: 'map',
   view: new ol.View2D({
     center: [0, 0],