bug in base/outputs

Just a heads up that in base/outputs.tf there is a minor bug/typo:

```
output "aws_key_pair_id" {
  source "${aws_key_pair.id.auth.id}"
}
```

Should be this:

```
output "aws_key_pair_id" {
  value = "${aws_key_pair.id.auth.id}"
}
```
