add a basic TileSet class

test/spec/ol/TileSet.test.js

@@ -0,0 +1,8 @@
+describe("ol.TileSet", function() {
+    describe("creating a tileset", function() {
+        it("creates a tileset instance", function() {
+            var tileset = new ol.TileSet();
+            expect(tileset instanceof ol.TileSet).toBe(true);
+        });
+    });
+});