v1.0.11

Small image problem is that when original image size is less than preview. In this case lens goes out of box into top left which makes small preview image stick to the bottom right. And overall this looks very bad.

• Fixed position of lens, now they are centered on small image.
• Added new option openOnSmall: true to control whether to open or not zoom on small image. But loading is still happens, because we need to calculate image size.