added stage nestedTransformsEnabled flag

test/unit/Stage-test.js

@@ -427,4 +427,37 @@ suite('Stage', function() {
 
         //console.log(stage.getStage());
     });
+
+      // ======================================================
+      test('stage.nestedTransformEnabled', function(){
+        var stage = addStage();
+        var layer = new Kinetic.Layer();
+        var group = new Kinetic.Group();
+        var circle = new Kinetic.Circle({
+            x: 100,
+            y: 100,
+            radius: 70,
+            fill: 'green',
+            stroke: 'black',
+            strokeWidth: 4,
+            name: 'myCircle',
+            draggable: true
+        });
+
+        group.add(circle);
+        layer.add(group);
+        stage.add(layer);
+
+        assert.equal(stage.isNestedTransformsEnabled(), true);
+
+        stage.disableNestedTransforms();
+
+        assert.equal(stage.isNestedTransformsEnabled(), false);
+
+        stage.enableNestedTransforms();
+
+        assert.equal(stage.isNestedTransformsEnabled(), true);
+
+
+      });
 });