Pull for new installation mechanism

Hey Brian, if you're interested, I wrote a bunch of Ubuntu build scripts to create a .deb package so you can use upstart to manage the service, a la:

sudo service sshuttle start; sudo service sshuttle stop

It creates all of the needed firewall rules and whatnot in the startup script, tearing them down, and sticks the code in some "system friendly" spots.

I'm still working out some of the final details (different architectures, testing on multiple types of systems, etc), but it works well now.