Update various examples to use the Mapbox v4-API

examples/tile-transitions.html

@@ -7,6 +7,9 @@ docs: >
   250 ms.  To disable this behavior, set the <code>transition</code> option
   of the tile source to 0.
 tags: "fade, transition"
+cloak:
+  - key: pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2pzbmg0Nmk5MGF5NzQzbzRnbDNoeHJrbiJ9.7_-_gL8ur7ZtEiNwRfCy7Q
+    value: Your Mapbox access token from https://mapbox.com/ here
 ---
 <div id="map" class="map"></div>
 <label>