Middleware not being tested

I found that I had an error in my middleware but this was not caught by the tests. It looks like the tests do not run the middleware. This would be great feature to add.

Steps to repro:
1. Install Botman Studios
2. Add Middleware with `die();` in methods.

Expectation: Tests will fail and Botman Tinker will not respond.

Actual: Tests pass and Botman Tinker does not respond.

Temporary Solution: Mirror the middleware statements in `BotManController` to the test's `CreatesApplication.php`.

Proposed solution: I believe an ideal solution might be to have the `BotManServiceProvider` register the middleware and botman route from the specification of the botman config. This would remove the `handle` method from `BotManController` so that this controller is no longer required. Is there other logic that others might be using `handle` for that would need to be accounted for in this refactor?