Scrapy-redis-statictyped

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* Fixes wrong message on dupefilter duplicates.

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* Fixed typo in default settings.

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* Fixed data decoding in Python 3.x.
* Added ``REDIS_ENCODING`` setting (default ``utf-8``).
* Default to ``CONCURRENT_REQUESTS`` value for ``REDIS_START_URLS_BATCH_SIZE``.
* Renamed queue classes to a proper naming conventiong (backwards compatible).

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* Added ``REDIS_START_URLS_KEY`` setting.
* Fixed spider method ``from_crawler`` signature.

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* Support ``redis_cls`` parameter in ``REDIS_PARAMS`` setting.
* Python 3.x compatibility fixed.
* Added ``SCHEDULER_SERIALIZER`` setting.

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* **Backwards incompatible change:** Require explicit ``DUPEFILTER_CLASS``
setting.
* Added ``SCHEDULER_FLUSH_ON_START`` setting.
* Added ``REDIS_START_URLS_AS_SET`` setting.
* Added ``REDIS_ITEMS_KEY`` setting.
* Added ``REDIS_ITEMS_SERIALIZER`` setting.
* Added ``REDIS_PARAMS`` setting.
* Added ``REDIS_START_URLS_BATCH_SIZE`` spider attribute to read start urls
in batches.
* Added ``RedisCrawlSpider``.