Adding ZooStream

[marten]

I'd like to add ZooStream publishing (basically writing out all classifications to a single event stream in Kinesis, so that we get a complete aggregated stats board over all our apps). I would've just done it and sent a PR, but Scribe doesn't yet have a background queue it seems, and this should probably be processed out-of-band. What are your thoughts on adding e.g. Sidekiq for this?