Rentier-scrapy-proxy-rotator

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* ``max_proxies_to_try`` request.meta key allows to override
``ROTATING_PROXY_PAGE_RETRY_TIMES`` option per-request.

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* Update default ban detection rules: scrapy.exceptions.IgnoreRequest
is not a ban.

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* changed ``ROTATING_PROXY_PAGE_RETRY_TIMES`` default value - it is now 5.

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* improved default ban detection rules;
* log ban stats.

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Initial release