Add option for resizing image to crop box's longest side (on image load)

[cornellsteven]

I like that the loaded image is automatically centered when it's loaded, but I find it helpful to automatically resize the image to fit to width or height (depending on whether the crop box is portrait or landscape).

And since it's just an option, it obviously won't do it automatically.

[lucianobosco]

Great! thank you so much, it works perfect!

[cornellsteven]

@luchorengo I'm glad someone else found it useful! Glad I could help.

[sconsult]

Hi @cornellsteven

I tested your code, and the initial load works perfectly. However in my testes there were issues with zooming after the load. (jumps directly to out of fitthelongest mode)

If you want to take a look at that it would be great, otherwise i can promise you we will use your code as baseline for the next update

Cheers and thank you for your contribution.

Mat