faktory_worker_ex

# faktory_worker_ex changes

0.4.0
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* Faktory 0.6.x support @acj @valo
* Authentication support @acj
* TLS support @acj
* The `:retries` option was renamed to `:retry` @valo
* Handle non-exception based errors (`{:EXIT, pid, :killed}`) @valo
* More tests and test specific "callbacks" to aid in testing.
* Update protocol to handle `$-1\r\n` @valo

0.3.0
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* Configure with Mix Config and callback.
* Independently configurable logger.
* Connection pooling for workers.

0.2.1
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* Start having a changelog.