png transparent background turned black

Hi again.

There is an issue with png files that has transparent background. I have resolved it.

In comur.image.library.js jcrop initialization must be bgColor: 'transparent' insteada of bgColor: 'black'.
In UploadController.php, line 337, the transparency is doing after other functions that breaks it. It must be moved to line 325, inmediately after imagecreatetruecolor call and before imagecopyresampled call.

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