Twiggy-goodies

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* Added new output `twiggy_goodies.logstash.LogstashOutput` which
sends json encoded data via UDP to a logstash server.
* Fixed errors related to missing `severity_names` in `JsonOutput`,
when `source_host` argument was specified.

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* Fixed issue when json output returned local date instead of UTC.

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* Now json serializer returns timestamp with explicit UTC timestamp.
This probably could broke someone's log processing pipeline, so
consider this release as backward incompatible.
* Also, now it depends on pytz package.

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* Fixed error in django logging middleware, caused by absent
Content-Type header in DELETE responses from django-rest-framework.

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* Fixed error when JsonOutput should write log into the current directory
but tries to create it first.

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This version makes futher steps to stiched log messages in
Django projects. It introduces several improvements:

* A middleware `twiggy_goodies.django.LogMiddleware`, which groups all messages,
logged within same http request-response cycle.
* A mixin for management commands `twiggy_goodies.django.LogMixin`, which does
same thing but for management commands.
* A decorator `twiggy_goodies.django_rq.job` which stitches messages within
single `python-rq's` job.

Logging configuration of `django-rq` and `python-rq` is non-trivial, so may be
I should write a separate documentation page with example.