Download files from an S3 bucket

Download all files from an S3 bucket and save contents to store.

If no transform is specified, save data as a string like

{ "filename": "contents"}

If a transform is configured, run the transform function on the data before saving.

Before running, set bucket permissions and credentials so that worker can access bucket.
See http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-configuring.html

config

• output - save results to this key
• bucket - name of bucket to download
• transform - filename containing transform function to run on data before saving (optional; default none)