Not able to scroll down on touch devices through image

[dankiv]

When I am using smartZoom plugin i can't scroll page on touch devices (ipad, iphone) when i scroll through image. On desktop it works fine with mouse wheel.

[Brewal]

Same problem here. We should be able to scroll down the content when the bottom of the image reaches the bottom of its container and scroll up when it reaches its top.

[Brewal]

I provided a fix to allow scrolling when the target (image) is not zoomed. I think it make sens in terms of UX. #27