fixed up group drag and drop

src/Canvas.js

@@ -195,10 +195,10 @@
         },
         _applyAncestorTransforms: function(node) {
             var context = this.context;
-            node.eachAncestorReverse(function(no) {
+            node._eachAncestorReverse(function(no) {
                 var t = no.getTransform(), m = t.getMatrix();
                 context.transform(m[0], m[1], m[2], m[3], m[4], m[5]);
-            });
+            }, true);
         }
     };