S3 helper that wraps the Delete Multiple Objects S3 POST call.

s3.delMultiObjects(objects, quiet, callback)

• 'object' - an Array of JavaScript Objects containing the S3 object list to delete. Has the following structure: [{key: '/path/to/object1'}, {key: '/path/to/object2'}]. For buckets that have object versioning, you may pass a versionId key: {key: '/path/to/object', versionId: 'version-id'}.
• 'quiet' - a boolean flag for enabling the quiet mode for the request. Defaults to false.
• 'callback' - the callback that is executed when the processing finishes. It has a couple of arguments: error and result.
• If there's an error, the callback receives the error argument as Error instance.
• If the error argument is null, then the response argument contains the response.headers object as returned by the node.js core HTTPS client.