[MRG+2] Fixes #685 FilesPipeline support for Google Cloud Storage.

[Doc] Update Response.body type

minor fix typo

Fix typos in tests

Print cryptography package version

Update pypy version regexp to get last release

PyPy changed naming conention since 5.8 release, not it's called
pypy2.7-x.x.x

This instance was missed in #2909 --> ur'Scrapy developers' --> u'Scrapy developers'

ur'string' not needed in Py 2, syntax error in Py3

Convert `u'(.*)\:\d+\:\s\[(.*)\]\s(?:(.*)\sto\s(.*)|(.*))'`--> `u'(.*)\:\d+\:\s\[(.*)\]\s(?:(.*)\sto\s(.*)|(.*))'`to be compatible with both Python 2 and Python 3.  See #2891

Convert `ur'Scrapy Documentation'`--> `u'Scrapy Documentation'`to be compatible with both Python 2 and Python 3.  See #2891

Move logging of overriden settings to Crawler init

# noqa to close #2836

[MRG+1] Follow alternate link for all types of sitemaps #2853

fix typo

[MRG+1] Explicit message for scrapy parse callback

- change ``failIf`` to ``assertFalse``
- change ``asertEquals`` to ``assertEqual``
- change ``assert_`` to ``assertTrue``

https://docs.python.org/2/library/unittest.html#deprecated-aliases