Support multiple schemas per route

For example, you might want to have several URLs each time a document is saved.

For example:

```
/path/to/image
/path/to/image/thumbnail
```

Or

```
/path/to/document
/path/to/document/edit
/path/to/document/vote
```

Ideally it would be good to allow these individual URls to be redirect to a different controller, using the dynamic routers `_type` (?) key.
