function serialize(reactorState) {
	  var serialized = {};
	  reactorState.get('stores').forEach(function (store, id) {
	    var storeState = reactorState.getIn(['state', id]);
	    var serializedState = store.serialize(storeState);
	    if (serializedState !== undefined) {
	      serialized[id] = serializedState;
	    }
	  });
	  return serialized;
	}
Returns serialized state for all stores
@param {ReactorState} reactorState
@return {Object}