Allow to prevent pods lookup of components

Follow up on: https://github.com/emberjs/ember.js/issues/18452

Basically, as of now, if you are using pods layout and have a route like this:

```app/my-route/template.hbs```

It will _always_ take this template when invoking a `` component, even if there is a more "specific" component defined somewhere (e.g. `app/components/my-route/template.hbs`).

As suggested by @rwjblue , it would be great if you could somehow deactivate this behavior. Either just for the new co-located components, or also for the above pods syntax. As it basically means that you _cannot_ have a component with the same name as any route.