Updated for Scrapy v1.0 API changes

[fraserharris]

• works in production without raising deprecation warnings
• Request Queue test fails, appears to be related to Scrapy v1 (?)

Test output: https://gist.github.com/fraserharris/df51b43184c8c35620cd

[jstoiko]

Thanks for the PR.

E       assert [] == [call('http://testdomain/pat...omain/path?wr=1&wa=1'), ...]
E         Right contains more items, first extra item: call('http://testdomain/path?wr=0')
E         Use -v to get the full diff

Same here. Don't have time to dig more though...