Fix formatting in test file
Add AWS.config.logger property to enable request logging

Set AWS.config.logger to an object that responds to write() or log()
(such as process.stdout or console) to have request details logged to
the stream/object.

Example:

```js
AWS.config.update({logger: process.stdout});
new AWS.S3().getObject({Bucket: 'bucket', Key: 'key'}).send();
```

Will log:

```
[AWS s3 200 0.2s 0 retries] getObject({ Bucket: 'bucket', Key: 'key' })
```