rename in examples

examples/cluster.js

@@ -1,5 +1,5 @@
 import _ol_Feature_ from '../src/ol/Feature.js';
-import _ol_Map_ from '../src/ol/Map.js';
+import Map from '../src/ol/Map.js';
 import _ol_View_ from '../src/ol/View.js';
 import Point from '../src/ol/geom/Point.js';
 import TileLayer from '../src/ol/layer/Tile.js';
@@ -67,7 +67,7 @@ var raster = new TileLayer({
   source: new _ol_source_OSM_()
 });
 
-var map = new _ol_Map_({
+var map = new Map({
   layers: [raster, clusters],
   target: 'map',
   view: new _ol_View_({