DNS recovery feature branch

[Raynos]

There is a feature branch open 0.0.4-dns-recovery to handle the various DNS recovery issues

Main issues

• [x] #4 Adding tests for UDP sockets
• [x] #3 work around lib/dgram.js node core memory leak
• [x] #5 remove stream helper dead code
• [x] #6 remove timeout dead code.
• [x] #7 implement static DNS resolvement.
• [x] #11 Implement a static ip seed list.
• [x] #10 coalesce multiple packets together
• [x] #12 implement a TTL refresh of the DNS lookup
• [x] #9 implement proper error handling on the UDP socket
• [x] #14 Revert the cleanup timeout code.
• [x] #15 Support statsite with trailing new line.
• [x] #16 Get gauge() to write to the socket directly

  Future improvements

• [ ] Rate limit the throughput in a statsd client.
• [ ] implement round robin hashing to multiple IPs
• [ ] warn about exceeding the sendQueue.
• [ ] allow passing in a logger.

cc @sh1mmer @kriskowal

[Raynos]

Todo.

• [x] Make option for trailing new line in packet queue.
• [x] Ensure DNS supports cname.
• [x] Audit for statsd + circuit breaker + logger as comments & todos.

[Raynos]

Final TODO.

• [x] #18 write documentation.

So close, one left.

[Raynos]

Landed on master, closing.