Change packages to artifacts

We now support Docker, so add this to the README...packages and artifacts.
Add libsqlite to the Vagrantfile

All of this needs to be broken out to support Debian and RHEL based
distros, but add this dependency for now.
Merge pull request #1 from blueboxgroup/dockerdockerdockerdockerdocker

use docker to build packages with docker on docker
Merge pull request #2 from craigtracey/vagrant-sqlite

Add libsqlite to the Vagrantfile
overwrite not always defined

Add the local variable 'overwrite' with a default value.
Merge pull request #6 from craigtracey/package-overwrite

overwrite not always defined
use ubuntu base