Add helpers for dynamically matching paths

[bryanrsmith]

We should expose the route recognizer functionality in a convenient way to make it easier to match incoming paths to routes in dynamic handlers. That could help with some scenarios where routes are loaded from remote data, etc. We should be able to refactor some of the createNavigationInstruction code to make it happen.

let recognizer = router.createRecognizer(routes);
...
let route = recognizer.recognize(instruction.fragment);

[valichek]

@bryanrsmith Looks like it is a good replacement for router.reset()?

[Alexander-Taran]

No activity since nov 2015
maybe can be closed

[EisenbergEffect]

Let's keep this open as a potential improvement, albeit low priority.