Ability to convert tokens to regex.

[rill-js]

The #parse method returns an array of tokens, it would be cool if we could pass in those tokens to get a regex again.

It would be useful to merge multiple parsed paths.

I could do a PR if anyone else things this is a good idea.

[blakeembrey]

@rill-js Great thought and easy enough to expose since that's what is already happening. Just curious, any thoughts on what you'd use it for?

Edit: I got the gist, was curious if you had a practical example/use on hand.

[rill-js]

Currently i'm creating a nested router, and the paths need to be merged to their parents as they are created. It would be a bit easier this way since I could just merge arbitrary tokens rather than worrying about repeating segments and "/".

More of a convenience really but it would be more efficient than rebuilding and re-parsing each regex every time. Also pretty easy to implement.

[blakeembrey]

@rill-js Could you review #53 and let me know if that's simple enough for you to use?