Scrapy-redis

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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``.

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* Updated code to be compatible with Scrapy 1.0.
* Added `-a domain=...` option for example spiders.

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* Added `REDIS_URL` setting to support Redis connection string.
* Added `SCHEDULER_IDLE_BEFORE_CLOSE` setting to prevent the spider closing too
quickly when the queue is empty. Default value is zero keeping the previous
behavior.
* Schedule preemptively requests on item scraped.
* This version is the latest release compatible with Scrapy 0.24.x.

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* Added `RedisSpider` and `RedisMixin` classes as building blocks for spiders
to be fed through a redis queue.
* Added redis queue stats.
* Let the encoder handle the item as it comes instead converting it to a dict.

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* Added support for different queue classes.
* Changed requests serialization from `marshal` to `cPickle`.

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* Improved backward compatibility.
* Added example project.