Adding thumbnails to image import listing.

I added one line to show a thumbnail of the images to be imported with Image_Import. To wit:

      $form['files']['dimensions'][$index] = array(
        '#type' => 'item',
        '#value' => $file->width .'x'. $file->height,
        '#suffix' => '<img src="'. base_path() . $file->filename . '" height="50px" />', //creates thumbnail for imported images before node creation
      );

Please comment and/or test.