sep#19 proposed changes
Add tests for start requests, filtered and non-filtered
test for RFPDupeFilter.request_fingerprint overriding
added note about RFPDupeFilter.request_fingerprint overriding to the settings documentation
added short RFPDupeFilter.request_fingerprint interface description
Merge pull request #597 from chekunkov/dupefilter_request_fingerprint_test_and_docs

Dupefilter request_fingerprint test and docs
Check pending start_requests before calling _spider_idle() in engine (fixes #706)
Merge pull request #707 from redapple/gh-issue-706-start-requests

[MRG] Fix engine to support filtered start_requests
Merge pull request #705 from Curita/sep19-update

Per-spider settings and api cleanup: sep#19 update
add Julia to SEP-019 authors
grammatical issue
Merge pull request #711 from cerivera/master

grammatical issue
Elaborated request priority value.
Merge pull request #714 from andrewbaxter/master

Elaborated Request priority value in Scrapy docs
set the exit code to non-zero when contracts fails
Merge pull request #727 from tpeng/fix-scrapy-check-exitcode

set the exit code to non-zero when contracts fails