Removed casting to bool just before negation.
Fixed #21084 -- Used proxy model's content type for admin log entries.
Fixed #21084 -- Used proxy model's content type for admin log entries.

(the previous commit included only the test)
Added missing request parameter to get_current_site().
Fixed #22405 -- Fixed string error in models/queries docs.
Fixed #9535 -- Added a reference guide for file upload classes.
Fixed some spelling issues in docs.
Added Python 3.4 to list of supported version in docs/intro/install.txt
Fixed #16205 -- Added an installation for Windows.
Refs #21230 -- removed direct settings manipulation from signed cookies tests