We've just found that the pagination query parameters in the users resource in the Abiquo API are not consistent with the pagination in other resources. The `page` and `numResults` parameters are only used in the `users` list, and in all the other resources they are named `startwith` and `limit`. I've opened an issue to change the Abiquo API accordingly to make the query parameters in the `users` resource consistent with the rest of the API.

Even if the Abiquo API is not consistent, we can make the jclouds interface consistent in the meanwhile. I'd just remove the `page` and `numResults` property, and use the `startwith` and `limit` methods of the builder when creating the UserOptions, and in the `build()` method, just add the `page` and `numResults` parameter by checking the presence and value of those fields. This way the UserOptions usage will be the same than other options.