stddev is the square-root of the variance
Close the tcp socket on Errno::EPIPE.
Add trouble shooting link to README

Make the troubleshooting page more prominent so users do not chase down weird behavior in their production environments.
Merge pull request #31 from xrl/patch-1

Add trouble shooting link to README
Merge pull request #29 from jordansissel/patch-1

stddev is the square-root of the variance
Release 0.9.9.3
Merge pull request #30 from bernd/tcpsocket-epipe-fix

Close the tcp socket on Errno::EPIPE
Release 0.9.9.4