How to use layout with handlebars? 
Used koa-generator (koa2 -e --hbs) to generate base code, it generates this: 

``` JAVASCRIPT
app.use(views(__dirname + '/views', {
  extension: 'hbs',
  map: { hbs: 'handlebars' }
}));
```

By default this doesn't render the layout.hbs at all so I changed it to this: 

``` JAVASCRIPT
app.use(views(__dirname + '/views', {
  extension: 'hbs',
  map: { hbs: 'handlebars' },
  layout: 'layout'
}))
```

Adding `layoutPath: __dirname + 'views/'` doesn't seem to work either.

Any ideas or am I doing something wrong here? 
