TCP exception is uncaught.

[ryanramage]

Seems when couch is unavailable, we get an uncaught exception once in a while along the lines of:

info: [gardener] polling couch for design doc changes.
info: [gardener] adding uninstall task to the queue.

events.js:66
        throw arguments[1]; // Unhandled 'error' event
                       ^
Error: Parse Error
    at Socket.socketOnData (http.js:1356:20)
    at TCP.onread (net.js:404:27)