code: function onFetchSuccess(model, params, result) {
    Flux.dispatch(actionTypes.API_FETCH_SUCCESS, {
      model: model,
      params: params,
      result: result,
    })
    return result
  }
docs: Handler for API fetch success, dispatches flux action to store the fetched
  result in the api cache
  @param {Model} model
  @param {*} params used to call the `model.fetch(params)`
  @param {Object} result
  @return {Object}