Add save status check

*Note: job statuses are currently not supported, so you must manually poll the job status API for app creation.*
```ruby
body = {}
until %w{failed completed}.include?(body["status"])
  response = client.connection.get(app.response.headers["Location"])
  body = response.body

  sleep(body["retry_in"])
end
```
^ From README

This PR intends to officially add support to status checking