In many places we were checking for identity which was the shorthand for
checking if the resource had been saved by the service.
The #persisted? method was added to show a clearer intent and also offer
minimal ActiveModel interface
* Request tests for accounts, api_clients, cloud_ips, images, interfaces, server types, user and zones
* Added 'ready?' methods to CloudIp and Image models
* Reworked brightbox helper to include Format patterns for all of the
* Added "hack" to allow select objects to be one class OR NilClass for fields that may be a JSON string or null if unset
* Some tests are not enabled (commented out) because they need manual steps (such as uploading Image to your account before registration)
