escape dot in .gitignore
handle crawlera deploy + restore original slot delay when response received
test download delay adjustment
helper method _is_enabled_for_request
tests fixed
download_delay = 0 by default, refactored open_spider, tests
typo
[crawlera] - fixed comments
Merge pull request #43 from scrapinghub/crawlera_middleware_enhancement

Crawlera retry delay