Support Storable properties

[Oyvindkg]

Properties of a Storable type should be seamlessly added and retrieved

Example
The owner should be added to the database when the dog is added to the database, and retrieved when the dog is retrieved.

class Dog: Storable {
  var id: Int?
  var name: String?
  var owner: Owner?
  var birth: NSDate?
}

class Owner: Storable {
  var id: Int?
  var name: String?
}

[Oyvindkg]

This is supported in the soon-to-be-released 2.0