deprecate the non `.match()` API

[yoshuawuyts]

When #9 lands, we should deprecate the other API. We should probably also take that chance to deprecate .curry (related to #10) and rewrite this to prototypes (as per #6).

[marcbachmann]

The new .match method only returns a matched route, but doesn't invoke the handler.
So I'd still keep the .emit method.

[yoshuawuyts]

@marcbachmann yeah, alright. Sounds fair!