Adding options to receive 401, 403, 503, etc.. with true/false optional

It would be great if we had the ability to to things like:
- receive_403
- receive_401 optional

etc... for all possible response status.

I tried doing it by adding:

```
#
def receive_401(opts = {})
    handle_response 401, opts
end
```

And this actually works, but always with optional="true", and I can't figure out how to set it to that (I don't know anything about Ruby)

Thanks!

David
