Fix Server crash when Client times out

[f1sherman]

Fixes #724

This fixes an issue where, when the Spring client times out or otherwise disconnects from the server, that the server crashes with a Broken pipe (Errno::EPIPE) error.

My apologies for not writing a test. I can't get the acceptance tests to run on my machine and I couldn't find an obvious place to put a unit test. Please let me know how you'd like me to proceed.