Update various examples to use the Mapbox v4-API

examples/tile-load-events.html

@@ -9,6 +9,9 @@ docs: >
   progress.  This example registers listeners for these events and
   renders a tile loading progress bar at the bottom of the map.</p>
 tags: "tile, events, loading"
+cloak:
+  - key: pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2pzbmg0Nmk5MGF5NzQzbzRnbDNoeHJrbiJ9.7_-_gL8ur7ZtEiNwRfCy7Q
+    value: Your Mapbox access token from https://mapbox.com/ here
 ---
 <div class="wrapper">
   <div id="map" class="map"></div>