refs #9601
Example:
```
collections:
/podcast/:
permalink: /{slug}/
```
- the name of the collection is remembered as `routerName` (in the case above: "podcast")
- the name of the collection is important for two things
1. context value
2. template name
- the context value is available for specific theme helpers e.g. is helper, body_class helper
- we auto-lookup the collection name in your theme e.g. podcast.hbs
- this logic does not apply to static routes
- if you define templates on your collection, they are stronger than the collection name
a1b55509df