Bad example for Node Lists

In [Node Lists](https://github.com/dchambers/composerjs#node-lists) you have this example:

``` javascript
model.addNodeList('nodes');
model.nodes.addHandler([], ['name'], function(input, output) {
    output.name = 'node #' + (index + 1);
});
```

Which is wrong for two reasons:
- does not have an input
- uses the now-gone `index` param
