Development updated to Drupal-4.7.5

I updated Development to drupal version 4.7.5. We'll test this for a while to see if everything works before updating production.

Instead of my usual (convoluted) method of updating, I just untar'd the new drupal version over Westgate and dealt with the conflicts. Seemed to work much easier. I'll get around to updating the upgrade howto document at some point.