kontrol: new signature for getKites()

[humanchimp]

on the kite.js side, we're doing:

ok = k.tell('getKites', [query, changesHandler]);

I think we want to get rid of these positional parameters (or at least avoid them). I would like it if the signature changes to this:

ok = k.tell('getKites', [{ query, onChange }]);

And once we do https://github.com/koding/kite.js/issues/2, we can remove the extra array wrapper:

ok = k.tell('getKites', { query, onChange });

I am open for suggestions, but for the time being I've chosen the name onChange. The name is not important to me, but I would like to move away from positional parameters.

[cenkalti]

I will do this after #14