Update the implementation

 - Call .send() with one arg, a string.
 - Allow dnsResolver options in statsdclient
 - Fixup statsd-client to use single quotes
 - Fix bug in the prefix check.
 - Fix bug in socket_timeout being set to 1000 if 0.
write better README
more tests, better code coverage
Merge pull request #18 from uber/0.0.4-dns-recovery.docs

Documentation and testing improvements