This adds thumbnail generation. 

This adds thumbnail generation using a couple of GD commands. PHP boxes should have access to these commands as php 4.3+ came bundled with PHP GD Library and most boxes are on 5+ now.

I could do a manual update too that basically makes mention to the fact that CUSTOM thumbnails could be made as well by just dropping in your own thumbnail images of the same name into that folder.

Code is set to make thumbs 400px width right now.