The problem is that I mimicked the pyramidal stuff by allowing either media/thumbnails *or* a thumbnail configuration path, and tried to make the web path and the file path match to some degree.  This makes it tough to be able to guarantee any top-level path.  So, for instance, if the disk path is configured to be `/opt/oregondigital/media/thumbnails`, and we put an image in `foo/bar/image.jpg`, the relative path is based on the configured value, giving us just `foo/bar/image.jpg`.  I think it probably makes more sense to just split up web and disk paths entirely, rather than trying to make the two based off each other in some way -- or we ditch the configurability and make /media/thumbnails a required web path.