Expose router engine for other implementations #29
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From #13.
Closes #12.
Implements custom path implementations via router inheritance.
Edit: I also still prefer the simplicity of this PR over #22. If you think about it this way it's cleaner - the router engine is the most basic router which takes a function as the "path matcher". Other implementations can build on this to take strings and regexps, etc. The path accepted for
route
anduse
can be though of as the "label" for debugging (and backward compat).