The ID still needs to be returned here, since there is no other way that the caller would know what ID was generated for the group.

Also, since the view manifest schema was changed to contain the state, and what is returned by `create_scaling_group` [should be the same as the manifest](https://github.com/rackerlabs/otter/blob/master/otter/models/interface.py#L555), state needs to be returned in this dictionary too :)