Scrapy-rotating-proxies

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* ``mean_backoff_time`` stats are always returned as float, to make
saving stats in databases easier.

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* Fixed incorrect "proxies/good" stats values.

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Proxy information is added to scrapy stats:

* proxies/unchecked
* proxies/reanimated
* proxies/dead
* proxies/good
* proxies/mean_backoff

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* ``ROTATING_PROXY_LIST_PATH`` option allows to pass file name
with a proxy list.

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* ``ROTATING_PROXY_BACKOFF_CAP`` option allows to change max backoff time
from the default 1 hour.

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* fixed proxy authentication issue.