Before & After commit hooks

[josh-taylor]

Adds callbacks for creating/created/updating/updated models on a controller.

Callbacks can be defined in controllers that inherit the EloquentController.

class UsersController extends EloquentController
{
    protected function creating(Model $model)
    {
        // Before the model is created.
    }

    protected function created(Model $model)
    {
        // After the model has been created.
    }

    protected function updating(Model $model)
    {
        // Before the model is updated.
    }

    protected function updated()
    {
        // After the model has been created.
    }
}

---

See #11 for a bit more discussion.`

[lindyhopchris]

I think afterCommit should only be called if $result is true

[josh-taylor]

That makes sense.

[lindyhopchris]

@josh-taylor thanks for taking the time to submit! Just a few comments above but this should be good to merge once you've taken a look at those.

I'll probably add saving, saved, deleting and deleted hooks as well, but I can do those later once this is merged.

[josh-taylor]

Updated!