Added to_nsq tool - Addresses #304

Added a simple `to_nsq` tool that scans from `stdin` and publishes them.
unfortunately we can't use a `bufio.Scanner` because we still maintain compatibility with go1.0

FWIW I only think we need to support line oriented input in this first path, so we can just use a `bufio.Reader` and `ReadSlice` with a delimiter of `\n`