title: Backbone add event
body: <p>I have a collection where is has an event that gets fired when a model is added. I have read in the docs where it should have an options parameter but not able to get to it. 
  I basically want to find the index the model is at in the collection.
  Inside my collection I have this.</p>
  
  <pre><code>    initialize: function( ) {
          this.bind( 'add', this.onModelAddedd, this );
      },
  
      onModelAddedd: function( model, options ){
  
             console.log("options = ", options);
      }
  </code></pre>