Add option to update the result image, without using live update.

[CrackerakiUA]

I am using it on one project, where my result image is 1920 * 1080 and it's a bit lagging on handling. I do have button for update the cropped image, so in that case i don't need cropper to update result image every time i drop dragging.

[CrackerakiUA]

Hope my new release didn't got you any issues. Write here if you got any bug or something with it. If you do post, make sure you have created codepen which show the problem.