DSL support for aliasing attributes

[palexander]

There are cases where Goo objects may need to reference attributes that exist on other Goo objects, generally when you have a container object (Ontology) and related objects (OntologySubmission). For example, when serializing OntologySubmission you want to display the acronym, groups, etc which only exist on the Ontology object.

Here's a sample syntax

class Ontology
  attribute :acronym, :unique => true
  attribute :creator
end

class OntologySubmission
  attribute :submissionId, :unique => true
  attribute :ontology, :instance_of => {:with => :ontology}
  # Default
  alias_attribute :acronym, :instance_of => {:with => :ontology}
  # Change the attribute name
  alias_attribute :author :instance_of => {:with => :ontology, :attribute => :creator}
end

Not sure if this should support read/write or just read