Twiggy-goodies

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* `JsonOutput` became more configurable and now format can be
changed by overloading `get_log_entry` method. Thanks to
the [Alexander Akhmetov](https://github.com/alexander-akhmetov).

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* Now `filename` is optional for `JsonOutput`. And new parameter `stream` can be given.
For example, `stream=sys.stdout`.
* Also, `setup_logging` now uses `JsonOutput` with `stream=sys.stdout`, if
`filename` is `None` and `format='json'` (this is default). This makes
possible to output in JSON to stdout.

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* Fixed json and syslog loggers for Python 3.5.
They were unable to log tracebacks.

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* Fixed errors with missing fieldsDict and addEmitters in `twiggy` >= 0.4.6 on python3.

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* Fixed issue when twiggy's plain text broke on unicode field values.

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* Django-rq's `job` decorator was fixed and now could be used
with arguments, like the original one.