Enums aren't used

[nolanamy]

A number of enums are defined – for example, in sections/fulfillment.js, we have:

const enums = {
    ResponseGroups() {
        return new Enum(['Basic', 'Detailed']);
    },
    ShippingSpeedCategories() {
        return new Enum(['Standard', 'Expedited', 'Priority']);
    },
    FulfillmentPolicies() {
        return new Enum(['FillOrKill', 'FillAll', 'FillAllAvailable']);
    }
};

– but none are used. Would require grabbing the section's enums in api.js, passing into AmazonMwsRequest, and handling enum types in getValueForParam in request.js