Paweł Miech

make offsite middleware downloader middleware instead of spider middleware

10

Currently [offsite middleware](http://doc.scrapy.org/en/1.1/topics/spider-middleware.html?highlight=offsite#module-scrapy.spidermiddlewares.offsite) is spider middleware. It works only on spider output, only processes requests generated in spider callback. But requests in Scrapy can be scheduled outside spider callback. This...

fix for #162 Need to add unit test for it