Adding a way to configure a scope to factory function

[luizfilipe]

This code with a test helps solve the issue #26

The layout of the new configuration is added as a unit test, but you can see how it is below:

{
    "testSelfProperty": {
        "enabled": true,
        "priority": 10,
        "module": {
            "name": "./fixtures/middleware/self",
            "method": "run",
            "self": true
        }
    }
}

[aredridel]

Needless comments -- git annotate will show who created what.

[grawk]

@aredridel mentioned perhaps the this arg should just be module by default. That would greatly simplify this PR. I cannot think of any drawbacks to doing so.

[aredridel]

Not just default, but the only option.

[grawk]

Yes, sorry. Semantics :)

[luizfilipe]

Ok then I´ll use module as only option then, based in comments of @aredridel and @grawk the option self that would be changed to context will be completely removed then.
Let me know if is this, when possible, to proceed with readjustment of PR.
Another good thing to ask for, is about the Unrelated changes that I made. The reason for this changes is that the tests were failing.

[aredridel]

In general, 'clean-up' fixes are good to add in a separate commit -- get the tests passing first, then add your tests + feature and make sure they still pass afterward.

It's not super problematic -- and bad on us for letting the lint fail the tests! -- but just a good practice. Makes changes more reviewable in the future.

[luizfilipe]

@grawk @aredridel I´ve finished, please review as soon as you can.

[aredridel]

👍

[totherik]

Yep, LGTM.