Update wmts-hidpi, add nicer-api-docs

nicer-api-docs/examples/xyz-esri.js

@@ -0,0 +1,21 @@
+var attribution = new ol.Attribution({
+  html: 'Tiles &copy; <a href="http://services.arcgisonline.com/ArcGIS/' +
+      'rest/services/World_Topo_Map/MapServer">ArcGIS</a>'
+});
+
+var map = new ol.Map({
+  target: 'map',
+  layers: [
+    new ol.layer.Tile({
+      source: new ol.source.XYZ({
+        attributions: [attribution],
+        url: 'http://server.arcgisonline.com/ArcGIS/rest/services/' +
+            'World_Topo_Map/MapServer/tile/{z}/{y}/{x}'
+      })
+    })
+  ],
+  view: new ol.View2D({
+    center: ol.proj.transform([-121.1, 47.5], 'EPSG:4326', 'EPSG:3857'),
+    zoom: 7
+  })
+});