Like someone else pointed out, boardgamearea.com, yucata.de and (my favorite) http://play.boardgamecore.net/ also manage the game state for you.
I've been working on a (very early stages still) rules engine that will hopefully make it easier for more websites like the above to pop up in the future: https://github.com/google/boardgame.io
Do you have any desire to add AI? I could almost write a generic AI for your current version; the two things that are missing are a way to enumerate the possible moves (the ability to pass extra arguments to a move causes issues there), and a way for the game to know when a turn is supposed to end.
(I'm also at Google; drop the j from my name to get my ldap.)
One of the selling points of a project like this would be access to machine readable game logs that people could use to train bots offline.
Having something generic that could play reasonable moves by exploring a possible list of moves (and their outcomes a few levels deep) sounds pretty exciting too. Let's talk :)
If having something simple in place prompts someone from the AI community to come try something more sophisticated, I'd certainly enjoy the show.
While yours is very react/UI focused, this is still very helpful.
Also, why is it copyrighted by google?
I'm a Googler, so released it under Google's open source program (it's not an official product, though).