We already have a config key, and it is `router` ( see https://github.com/zendframework/ZendSkeletonApplication/blob/master/module/Application/config/module.config.php#L11 )

It would be very confusing IMO to have config like:

```php
return array(
    'router' => array(
        'routes' => array(...),
    ),
    'routes' => array(...),
);
```

Should probably continue to be `router`