var bsync = Backbone.sync;
	Backbone.sync = function(method, model, success, error) {
		console.log('Syncing: '+method);

		if(method === 'update') {
			var changed = model.changedAttributes();
			console.log(changed);

			var sync_model = new Criteria(changed);

			bsync(method, sync_model, success, error);
		} else {
			bsync(method, model, success, error);
		}
	};