Scrapy-redis-statictyped

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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.

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* First release on PyPI.