added counter pixel ratio method so that drawings aren't double scaled when using toDataUrl and toImage

src/Canvas.js

@@ -187,6 +187,13 @@
             if(pixelRatio !== 1) {
                 this.getContext().scale(pixelRatio, pixelRatio);
             }
+        },
+        _counterPixelRatio: function() {
+            var pixelRatio = Kinetic.Canvas.pixelRatio;
+            if(pixelRatio !== 1) {
+                pixelRatio = 1 / pixelRatio;
+                this.getContext().scale(pixelRatio, pixelRatio);
+            }
         }
     };
 

src/Layer.js

@@ -40,7 +40,7 @@
             this.afterDrawFunc = undefined;
             this.canvas = new Kinetic.SceneCanvas();
             this.canvas.getElement().style.position = 'absolute';
-            this.hitCanvas = new Kinetic.HitCanvas(0, 0);
+            this.hitCanvas = new Kinetic.HitCanvas();
 
             // call super constructor
             Kinetic.Container.call(this, config);

src/Node.js

@@ -760,6 +760,8 @@
             }
             context = canvas.getContext();
             context.save();
+            canvas._counterPixelRatio();
+            
             if(x || y) {
                 context.translate(-1 * x, -1 * y);
             }

src/Stage.js

@@ -563,7 +563,7 @@
             this.attrs.container.appendChild(this.content);
 
             this.bufferCanvas = new Kinetic.SceneCanvas();
-            this.hitCanvas = new Kinetic.HitCanvas(0, 0);
+            this.hitCanvas = new Kinetic.HitCanvas();
 
             this._resizeDOM();
         },