debian package requires python-cssselect
Drop Python 2.6 support
Merge pull request #448 from dangra/drop-py26

Drop Python 2.6 support
python3: scrapy.__version__, NoneType, urlparse_monkeypatches
Merge pull request #452 from alexanderlukanin13/python3

PY3: scrapy.__version__, NoneType, urlparse_monkeypatches