prettier, fix some tests, new test runner

test/unit/Stage-test.js

@@ -1046,45 +1046,6 @@ suite('Stage', function() {
     assert.equal(dblicks, 1, 'first dbclick registered');
   });
 
-  test.skip('toDataURL + HDPI', function(done) {
-    Konva.pixelRatio = 2;
-
-    var stage = addStage();
-    var layer = new Konva.Layer();
-
-    var image = new Image();
-    image.onload = function() {
-      var lion = new Konva.Image({
-        image: image,
-        draggable: true
-      });
-
-      lion.cache();
-      lion.drawHitFromCache();
-
-      layer.add(lion);
-      stage.add(layer);
-      stage.draw();
-
-      var snapshotStage = addStage();
-
-      stage.toImage({
-        callback: function(image) {
-          var imageNode = new Konva.Image({
-            image: image
-          });
-          var snapshotLayer = new Konva.Layer();
-          snapshotLayer.add(imageNode);
-          snapshotStage.add(snapshotLayer);
-          snapshotStage.draw();
-          Konva.pixelRatio = undefined;
-          done();
-        }
-      });
-    };
-    image.src = 'assets/lion.png';
-  });
-
   test('toDataURL in sync way', function() {
     var stage = addStage();
     var layer = new Konva.Layer();