Atlas

Atlas-Enabling the Bill's Kitchen DevPack.

HashiCorp released Atlas today, and I'm super excited and eager to try it out:
https://atlas.hashicorp.com

This PR adds the missing tools (terraform, packer, consul) to the mix so we can use Bill's Kitchen for playing around with Atlas.

- [ ] update to Vagrant 1.7
- [ ] add terraform
- [ ] add packer
- [ ] add consul
- [ ] provide an example to be used for the acceptance test