Currently the admin interface image cropping tool does not update the cropper view or bounds when a new image is uploaded; the record must be saved first, then revisited to see the new image.

Listen to the hook for image file upload, and update the Jcrop viewer to both use the new image, and to reset the bounds to default to centering.

This may be complicated by the image file not existing yet at a media resources URL, as it is likely uploaded to S3 as part of saving the object.