Sprockets.logging

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- Switch to packaging as a package instead of a py_module.

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- Fix query_arguments handling in Python 3

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- Add the traceback and environment if set

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- Fix a potential ``KeyError`` when a HTTP request object is not present.

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- Monkeypatch logging.currentframe
- Include a logging message if it's there

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- Added :class:`sprockets.logging.JSONRequestFormatter`
- Added :func:`sprockets.logging.tornado_log_function`
- Added convenience constants and methods as a pass through to Python's logging package:

- :data:`sprockets.logging.DEBUG` to :data:`logging.DEBUG`
- :data:`sprockets.logging.ERROR` to :data:`logging.ERROR`
- :data:`sprockets.logging.INFO` to :data:`logging.INFO`
- :data:`sprockets.logging.WARN` to :data:`logging.WARN`
- :data:`sprockets.logging.WARNING` to :data:`logging.WARNING`
- :func:`sprockets.logging.dictConfig` to :func:`logging.config.dictConfig`
- :func:`sprockets.logging.getLogger` to :func:`logging.getLogger`