Widget thumbnail size

Terrific plugin, thanks! In addition to the albums, I use the widget to display random images in the sidebar. Only small thumbnails are supported, but medium thumbnails work better. I made some changes in the code to permit this.

I added photos-widget.php to add the thumbnail size option, as the regular Add Shortcode dialog does. I also had to change the image size manually in frontend-min.css, although I think there is already a tag to do this.

Perhaps the next time you make some changes to the code, you could incorporate this feature. THanks!