Fleet service scaling

Would you like to deploy services to a CoreOS cluster via fleet? Okay.
It feels weird that you're having to look at the `deployment[:count]` here again when you just did it above in the `.create` method. Can you just pivot on the presence/absence of the index, instead?

```
self.name = attrs[:name]
self.name += "@#{index}" if index
```
or
```
self.name = "#{attrs[:name]}#{index ? "@#{index}" : ''}"
```