Bug 1175478 - Update gunicorn to v19.3.0
Bug 1175478 - Update gunicorn to v19.3.0

http://docs.gunicorn.org/en/latest/2013-news.html
http://docs.gunicorn.org/en/latest/2014-news.html
http://docs.gunicorn.org/en/latest/news.html

https://github.com/benoitc/gunicorn/compare/17.5...19.3

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