Reset _writePos to zero.

This is a bug, we forgot to reset writePos
unref interval in packet-queue

The previous version of statsd-client would not keep
    a process open. This new version does.

To keep back compat we need to ensure that the statsd-client
    does not keep the process open.
Merge pull request #13 from uber/0.0.4-dns-recovery.bug-fixes

[DNS recovery]: Bug fixes
handle errors on the socket
Merge pull request #9 from uber/0.0.4-dns-recovery.error-handling

[DNS recovery]: handle errors on the socket
Revert "Merge pull request #6 from uber/0.0.4-dns-recovery.cleanup-timeout"

This reverts commit edad747e76c7c63a63d9779d7e09fa604f174725, reversing
changes made to 6888dd75c055a313663cf0649c177da2dfd7a241.

Conflicts:
	lib/EphemeralSocket.js
	test/socket.js