Non breaking feature, allows you to call protected services.

Before this changes you had to call a protected service like this:

```php
$results = $this['someFunc']('foo');
```

Now with this update we can call the protected service just as though
it was another method of the container. Like so:

```php
$results = $this->someFunc('foo');
```

> NOTE: I believe this was intended from day 1 however for
> what ever reason this functionality got forgotten.