Readable stream of object keys in a S3 bucket. Listings with more items than the S3 maximum of 1000 are automagically paginated.
var s3ls = require;s3ls.pipe;
opts must be passed in:
opts.key- AWS access key ID.
opts.secret- AWS secret access key.
opts.region- AWS geographic region.
opts.bucket- Existing S3 bucket for uploads.
Return a readable stream of object keys under the given