Making it clear in the README that you need to implement your own handler lookup.

Changed all references to router.handlers into myHandlers. This makes it clear that myHandlers is something created by the programmer, not this library. Also providing an implementation of getHandler the first time handlers is mentioned, making it easy to figure out what myHandlers actually is.
Merge pull request #38 from augustl/readme-gethandler

Making it clear in the README that you need to implement your own handler lookup.