Update wmts-hidpi, add nicer-api-docs

nicer-api-docs/examples/heatmap-earthquakes.js

@@ -0,0 +1,31 @@
+var vector = new ol.layer.Heatmap({
+  source: new ol.source.KML({
+    projection: 'EPSG:3857',
+    url: 'data/kml/2012_Earthquakes_Mag5.kml'
+  }),
+  radius: 5
+});
+
+vector.getSource().on('addfeature', function(event) {
+  // 2012_Earthquakes_Mag5.kml stores the magnitude of each earthquake in a
+  // standards-violating <magnitude> tag in each Placemark.  We extract it from
+  // the Placemark's name instead.
+  var name = event.feature.get('name');
+  var magnitude = parseFloat(name.substr(2));
+  event.feature.set('weight', magnitude - 5);
+});
+
+var raster = new ol.layer.Tile({
+  source: new ol.source.Stamen({
+    layer: 'toner'
+  })
+});
+
+var map = new ol.Map({
+  layers: [raster, vector],
+  target: 'map',
+  view: new ol.View2D({
+    center: [0, 0],
+    zoom: 2
+  })
+});