Stop one off Dyno with custom Type

**Potential Bug**
Start a one-off dyno with this command

`heroku.dyno.create(heroku_app, {command: "while :; do echo 'hit ctrl-c'; sleep 1; done", type: "test"})`

Heroku logs this:

`app[api]: Starting process with command 'while :; do echo 'hit ctrl-c'; sleep 1; done' by user`

But this Dyno is not killed with the command

`heroku.dyno.restart(heroku_app, "test.1234") # assuming the Dyno name is test.1234
Returned is an empty hash {}`

Stopping with `heroku ps:stop test.1234` works

This does not occur if you do not specify the "type" during the create call. For example, you can kill a one-off Dyno that is named something like `run.1234`