No need to check for a matched route in onPopState, renderCurrentRoute will handle any 404 routing.
Fixes #1

Bump rev to 0.2.0, since it changes route handling behavior.
Throw an error when no route matches, and no notFound handler exists.
Only require urllite/lib/core, reduces the built filesize substantially.
Return false if matchRoute fails to find a suitable route, instead of returning an empty object.