title: How can I add Ractive instances to a list? in a parent Ractive instance?
body: <p>I already have a Ractive <a href="http://docs.ractivejs.org/latest/new-ractive" rel="nofollow">instance</a> (or <a href="http://docs.ractivejs.org/latest/components" rel="nofollow">component</a> - it could be either) and I want to add it to a list in another Ractive instance.  Something like this:</p>
  
  <pre><code>var ListItemOne = new Ractive({
    data: { key: "hello" }
  });
  
  var ListItemTwo = new Ractive({
    data: { key: "world" }
  });
  
  var ractive = new Ractive({
    el: "#output",
    template: "#template",
    data: { greeting: 'hi', name: 'there',
        listItems: [
          ListItemOne,
          ListItemTwo
        ]
      }
  });
  </code></pre>
  
  <p>Template:</p>
  
  <pre><code>&lt;p&gt;{{greeting}} {{name}}!&lt;/p&gt;
  
  &lt;ul&gt;
    {{#listItems}}
    &lt;li&gt;{{key}}&lt;/li&gt;
    {{/listItems}}
  &lt;/ul&gt;
  </code></pre>
  
  <p><a href="http://jsbin.com/mucosutete/1/edit?html,js,output" rel="nofollow">jsbin</a></p>
  
  <p>Or using a method:</p>
  
  <pre><code>var ractive = new Ractive({
    el: "#output",
    template: "#template",
    data: {
      greeting: 'hi', name: 'there',
      listItems: []
     },
  
    addListItem: function(listItem){
      this.get('listItems').push(listItem);
    }
  });
  
  ractive.addListItem(ListItemOne);
  ractive.addListItem(ListItemTwo);
  </code></pre>
  
  <p><a href="http://jsbin.com/gisamewuye/1/edit?html,js,output" rel="nofollow">jsbin</a></p>
  
  <p>Is it possible to use Ractive in this way?</p>
  
  <hr>
  
  <p>Please note that I do not want this:</p>
  
  <pre><code>var ractive = new Ractive({
    el: "#output",
    template: "#template",
    data: { greeting: 'hi', name: 'there',
        listItems: [
          { key: "hello" },
          { key: "world" }
        ]
      }
  });
  </code></pre>
  
  <p>As I already have the Ractive instances/components, and I am using MVP to define explicitly define the interface between application and view.</p>