Talisker

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* fix encoding issue with X-Request-Id header (again!)

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* fix setuptools entry points, which were typoed into oblivion.

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* make gunicorn use proper statsd client
* log some extra warnings if we try to configure gunicorn things that talisker
overides.
* better documented public api via __all__
* first take on some celery helpers
* some packaging improvements

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* actually do remove old DEBUGLOG backups, as backupCount=0 does not remove
any. Of course.

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* Propagate gunicorn.error log, and remove its default handler.

This allows consistant logging, making the choice in all cases that your
gunicorn logs go to the same stream as your other application log, making the
choice in all cases that your gunicorn logs go to the same stream as your other
application logs.

We issue a warning if the user tries to configure errorlog manually, as it
won't work as expected.