code: function makeCo(Sequelize) {
  	const co = Sequelize.Promise.coroutine;
  
  	function coAll(obj) {
  		_.forIn(obj, (value, key) => {
  			if (isGeneratorFunction(value)) obj[key] = co(value);
  		});
  		return obj;
  	}
  
  	return {co, coAll};
  }
docs: Return `co` and `coAll` functions, using `Sequelize.Promise` (i.e. Bluebird)