* update Vagrantfile to modern Consul-style version
* add `make release` for a one-shot command to get from fresh vagrant
machine to a built release
* add RELEASING.md to document details about the release process
I think there is a missing escape in the Vagrantfile. Inside the VM I had to fix the /etc/profile.d/gopath.sh because it's contents were:
```
export GOPATH="/opt/gopath"
export PATH="/opt/go/bin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
```
BTW having a way to spin up a dev VM so easily made it a breeze to get hacking on Terraform! Great idea!
Paul Hinze