Various coordinate issues with scrolled down pages about cropme

[standuprey]

• When you single click somewhere on the image the cropping area is not centered on the mouse position -> Workaround makes sense I'll integrate it soon
• Resizing the image may be triggered when you click on a non-border location inside the image -> I am not sure I see what you mean. If you look at the code, there is a variable called borderSensitivity that is set to 8px, so that clicking 8px around the border is like clicking on the border
• Never seen the background image being dragged, would you be able to post an example? (note the last version allows for preloading an image url, which could be convenient to post an example)