Update terraform to v0.3.1

[Terraform v0.3.0](https://github.com/hashicorp/terraform/blob/v0.3.0/CHANGELOG.md) came out a few days ago. I've updated the go deps and added new requisite ones to the latest.

Additionally, since terraform now asks for "missing" vars, I added the var to the test so it will run (otherwise it would hang on console input).

Note: I'm not sure how the bottles work so I commented them out. I'm happy to make changes to update the bottles as well.