Add a simple oneliner way to add fallback routes to a scope.

I found I was repeating these same 2 lines in many places. Having
a simple macro for them will make working with routes a bit less
repetitive.
Make fallback routes use InflectedRoute.

This preserves behavior with the old default routes, and since we don't
have :controller as a default key, this solves needing to re-add
inflection in ControllerFactoryFilter.
Remove default routes.

Remove the default routes file that generates routes based on config
data. Routing in CakePHP 3.0 should be much more declarative and less
magic based.  While the scopes result in slightly more routes being
connected, the performance improvements are shown to offset any slowdown
even for large route sets.
Merge pull request #3876 from markstory/3.0-no-default-routes

3.0 no default routes