title: Inherit backbone attributes from parent model
body: <p>If i have this model:</p>
  
  <pre><code>var myParentModel = Backbone.Model.extend({
     defaults:{ parent1: null,
                parent2: null}
  )};
  </code></pre>
  
  <p>and i have another model:</p>
  
  <pre><code>var myModel = myParentModel.extend({
     defaults: {child1: null,
                child2: null}
  )};
  </code></pre>
  
  <p>if i instanciate a new myModel:</p>
  
  <pre><code>var mymodel = new myModel({child1: 'mychild1'});
  </code></pre>
  
  <p>In the attributes property i only have set to default the child2 property, how is the implementation to inherit the parents property of the parent model?</p>