First cut at using Vagrant for development

I imported and adapted the Vagrantfile and provisioning shell script
from Agile Ventures Local Support. The provisioning script imports the
generic Rails script from AgileVentures/setup-scripts.

This is held together with duct tape and string, but it works, so it is
ready for others to try out. Then we can make improvements based on
experience.
Fix typo: ruby version to install is 2.1.1
* vagrant-ubuntu-install.sh: rm commented code