Remove ugly factory method that did not really make things any DRYer given that jQuery's $.proxy can already serve that purpose.
Do not explicity set domain of session cookie to act in line with the admin panel's cookie setter. Setting to hostname explicitly results in leading dot.
Empty singular response is always undefined (which is different from no argument passed).
Include explanations, trade-offs and TODOs in code comments. Added an initial implementation of nouncies.publish(). And some minor polish here and there.