Sprockets-http

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- Add ``log_config`` parameter to ``sprockets.http.run``

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- Add support for ``sprockets.mixins.mediatype`` in ``sprockets.http.mixins.ErrorWriter``

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- Add ``sprockets.http.mixins.LoggingHandler``
- Add ``sprockets.http.mixins.ErrorLogger``
- Add ``sprockets.http.mixins.ErrorWriter``

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- Run callbacks from ``application.runner_callbacks['shutdown']`` when
the application is shutting down.
- Add ``number_of_procs`` parameter to ``sprockets.http``.

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- Install :func:`sprockets.logging.tornado_log_function` as the logging
function when we are running in release mode

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- Fixed requirements management... why is packaging so hard?!