remove the "spider=self" parameter(rmax#285)

src/scrapy_redis/spiders.py

@@ -190,7 +190,7 @@ def schedule_next_requests(self):
         """Schedules a request if available"""
         # TODO: While there is capacity, schedule a batch of redis requests.
         for req in self.next_requests():
-            self.crawler.engine.crawl(req, spider=self)
+            self.crawler.engine.crawl(req)
 
     def spider_idle(self):
         """