title: Flutter Navigation pop to index 1
body: <p>I am recursively adding routes to the navigator.  There could be 20 views or more.  Pop works as advertised, but I would like to pop to index 1 and remove all push history.   is there a way to replace this pop command with something like...  returntoIndex0...</p>
  
  <pre><code>      new ListTile(
          title: new RaisedButton(
            child: new Text("POP"),
            onPressed: () {
              var route = new MaterialPageRoute(
                builder: (BuildContext context) =&gt;
                    new NextPage3(value:"hi there from 3"),
              );
              Navigator.pop(context);
            },
          ),
        ),
  </code></pre>