Improve settings slightly
Added in Thumbnails

Features left to implment:
  - Create a 'ModelRow' abstraction, to represent each row.
  - Create a page to display a given work item.
  - Change work.php to use the database.
  - Calculate when a post is 'new'.
  - Refactor setup.php to not upload an image if at least one exists.
  - Refactor images / thumbnails