In my testing, I had to do the following to create a server

```
server = service.servers.create :name => 'my-server', :image_id => image.id, :flavor_id => flavor.id, :keypair => {:name => 'my-key'}
```

Do we need `:keypair` to reference a hash or could we get by with just using the key name like so:

```
server = service.servers.create :name => 'my-server', :image_id => image.id, :flavor_id => flavor.id, :keypair => 'my-key'
```