scrapy/scrapy — pull request #961 by ldmberman (2014-11-27 12:27:40+00:00)
Title: An attempt to resolve #977, add signal to be sent when request is dropped by the scheduler  

There are some ideas about how to solve the issue #977 in this patch. I am new to the project and thus may have missed something here.

Is it better to name the signal in a more specific way, eg ``request_dropped_by_dupefilter``?