DEFAULT_STREAM is not used anymore
prevent the daemonization with gevent loaded - related to #441
added the test
Enhance the exception messages consistency.

(thanks Barzogh for the notice)
started circus.green - related to #441
Merge pull request #443 from mozilla-services/fix-error-handling

Enhance the exception messages consistency.
removed the exit call  #438
We need zmq 2.X series
slient statsd - refs #438
more silencing #438
flaked8
hush! #438
finished the hush operation - fixes #438
resolve issue #447
Merge pull request #448 from mrijken/issue447

resolve issue #447