Add withRequiredScope

[chadicus]

The goal of this pull request is to keep the Authorization middleware reusable and allowing for various scope checking.

Example Usage:

$app->post('/foo', $authorization->withRequiredScope(['createFoos']), function () {
    //create a new foo
});

[coveralls]

Changes Unknown when pulling 0cbb729edf795a7f2e9d4f9bcef2a166260b443a on develop into ** on master**.