Adding mapbox-gl branch

mapbox-gl/examples/tilejson.js

@@ -0,0 +1,16 @@
+var map = new ol.Map({
+  layers: [
+    new ol.layer.Tile({
+      source: new ol.source.TileJSON({
+        url: 'http://api.tiles.mapbox.com/v3/mapbox.geography-class.jsonp',
+        crossOrigin: 'anonymous'
+      })
+    })
+  ],
+  renderer: exampleNS.getRendererFromQueryString(),
+  target: 'map',
+  view: new ol.View({
+    center: [0, 0],
+    zoom: 2
+  })
+});