added .gitignore
headers has to inherit scrapy.http.Headers for responsetypes to return the right Response class.
Merge pull request #1 from llonchj/master

headers has to descent from scrapy.http.Headers for responsetypes to return the right Response class.
add auth
Merge pull request #3 from t1h/add-auth

add auth
Merge pull request #1 from scrapinghub/master

latest from upstream