Changed the way images are served (related thumbs)

Related images now use the vt_resize script found on gist.git to
dynamically resize an image before its served. Images are saved for
later use. This way, the related thumb weren't loading the full sized
image every time the page was visited and no need for wordpress's kind
of crappy resizing only during upload. Added the function.php file to
see how the add is made at the bottom of it.