Add digitalocean as a provider for vagrant

I've got a slow-ass laptop, so deploying to digitalocean is faster, and
cheap enough that I don't care.

This sets some default passwords, which makes the box vulnerable, but
the machine is short-lived and has no sensitive information so it
shouldn't matter. Long-term, this should be fixed somehow.
Merge pull request #61 from taoeffect/digitalocean

Add digitalocean as a provider for vagrant
Ensure aliases exist for bounced mails. Enable delayed notifs. Fixes #59