Add small Vagrantfile for personal dev VM.
Ignore the generated vagrant files.
Create a development user.
Break user setup into separate file.
Clean up more files.
Fix some warnings.
Set up dotfiles for new user.
Setup docker on provisioning as well.
Make setup-docker executable.
Add the user to the docker group.
Install nsenter on the VM.
Remove all containers so we start out fresh.
Cups is apparently not installed.
Merge branch 'ps.add_personal_vagrantfile'

This adds a top-level Vagrantfile so I can more easily create development
VMs. Just run 'vagrant up' in this folder. Unfortunately, it takes a
while to run this since it checks out a whole bunch of git repos from
github.