No need to specify full box URLs with `kitchen-vagrant`
Expand platform matrix in build lab
Ensure local code is synced into build lab

If you would like ongoing changes on the host to be reflected
on the guest VMs you can use `vagrant rsync-auto`:

  $ cd .kitchen/kitchen-vagrant/chef-ubuntu-1204/
  $ vagrant rsync-auto
  ==> default: Doing an initial rsync...
  ==> default: Rsyncing folder: /Users/schisamo/dev/code/opscode/omnibus-chef/ => /home/vagrant/omnibus-chef
  ==> default: Watching: /Users/schisamo/dev/code/opscode/omnibus-chef
Update README with latest details on Kitchen-based build lab
Remove invalid `build_dir` attribute from .kitchen.yml
Merge pull request #155 from opscode/schisamo/test-kitchen-build-lab-fixes

Assorted fixes for the Test Kitchen build lab