Stop buildling for hardy and natty

[jdreed]

Natty reaches EOL on Oct 28. I'm going to turn off Hardy at the same time. But first we need to clear out -development and -proposed. I'm going to plan to push proposed to production on Monday. The only things in -development are -verify and -nautilus-afs, both of which need more testing, and neither of which will ever end up on hardy and natty, so I have daremoved them from those distros. After the cleanout on Monday, I will remove natty and hardy from debian-versions.sh. We should also devote some time later this fall or during IAP to cleaning up from pre-Lucid releases, since we have a lot of now-useless conditionals.