function reflect(fn) {
    return initialParams(function reflectOn(args, reflectCallback) {
        args.push(rest(function callback(err, cbArgs) {
            if (err) {
                reflectCallback(null, {
                    error: err
                });
            } else {
                var value = null;
                if (cbArgs.length === 1) {
                    value = cbArgs[0];
                } else if (cbArgs.length > 1) {
                    value = cbArgs;
                }
                reflectCallback(null, {
                    value: value
                });
            }
        }));

        return fn.apply(this, args);
    });
}
Wraps the function in another function that always returns data even when it
errors.

The object returned has either the property `error` or `value`.

@name reflect
@static
@memberOf module:Utils
@method
@category Util
@param {Function} fn - The function you want to wrap
@returns {Function} - A function that always passes null to it's callback as
the error. The second argument to the callback will be an `object` with
either an `error` or a `value` property.
@example

async.parallel([
    async.reflect(function(callback) {
        // do some stuff ...
        callback(null, 'one');
    }),
    async.reflect(function(callback) {
        // do some more stuff but error ...
        callback('bad stuff happened');
    }),
    async.reflect(function(callback) {
        // do some more stuff ...
        callback(null, 'two');
    })
],
// optional callback
function(err, results) {
    // values
    // results[0].value = 'one'
    // results[1].error = 'bad stuff happened'
    // results[2].value = 'two'
});