demo broken?

Hi,

Is the demo broken?  I add a message and firebase json is not updated.  Also your samples on the front page dont seem to work for me.  But that could be my lack of understanding.

eg:

var model =  ko.observable().extend('sync', store);
model.crud.create({u: 'test', m: 'hi'});

Falis with crud method not found.

I would love to use your binding, so any help would be great!

-trav.
