Export data as png instead of jpg

[minutejs]

Hi,

It would a good option to export the crop as png files to preserve transparency. We can add this as an option which defaults to jpg but we can override it.

I see the code to export the crop is this:

          var base64 = canvas.toDataURL('image/jpeg');
	  this.events.triggerHandler('Cropped', base64);

We can just change it to

          var base64 = canvas.toDataURL(this.options.format); //default is still jpeg for BC
	  this.events.triggerHandler('Cropped', base64);

What do you think? Should I submit a PR?

Thanks!
San.

[riccardomessineo]

+1 for the feature, we are facing the exact same problem :|