Switch to original image before animation

[allaire]

From what I see on the documentation page, the switch to the original image is done at the end. I think it would be great to have an option to switch the image before the animation starts. The image I use in my src is much smaller than my original one, so when the zoom animation take place, you can see some blurriness. I suppose this setting could only work when preloadImage is set to true to avoid performance issues.