function onFetchSuccess(model, params, result) {
	  Flux.dispatch(actionTypes.API_FETCH_SUCCESS, {
	    model: model,
	    params: params,
	    result: result });
	  return result;
	}
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}