app: Stdin and stdout interface

[matryer]

Would you guys be interested in some kind of tool (or tools) that use stdin and stdout to communicate with nsq?

It would enable people to do something like this:

mytool | to_nsq --topic="topic" --channel="channel" --delimiter="\n" --address="nsqaddr"

Suddenly, scripters would be able to use nsq without needing a client.

Similarly, you could have a subscriber that prints to stdout called from_nsq.

Mat

[matryer]

It would also enable testing capabilities too...

cat test-messages.json | to_nsq ...

[mreiferson]

basically a dupe of #304

FWIW we already have the output side in nsq_tail

These are good ideas, let's continue the discussion in #304