[1.5.x] Fixed #19562 -- cleaned up password storage docs

Conflicts:

	docs/topics/auth/passwords.txt
[1.5.x] Fixed #19571 -- Updated runserver output in the tutorial

Backport of a890469d3 from master.
[1.5.x] Created special PostgreSQL text indexes when unique is True

Refs #19441.
Backport of c698c55966 from master.
[1.5.x] Fixed typo in 1.5 release notes; thanks Jonas Obrist.

Backport of bb7f34d619bf from master.
[1.5.x] Updated deprecated test assertions
[1.5.x] Fixed #17541 -- Fixed non-saved/nullable fk querying

Backpatch of 55da775ce1bfba20db33b56c29957faa63917980
[1.5.x] Fixed #19576 -- Use `six.with_metaclass` uniformously accross code base.

Backport of f58efd07f from master.
[1.5.x] Fixed #19555 - Removed '2012' from tutorial 1.

Thanks rodrigorosa.lg and others for the report.

Backport of 99315f709e from master
[1.5.x] Added sphinx substitutions in place of hardcoded version numbers.

Refs #19571

Backport of 1884868adc from master
[1.5.x] Fixed #19546 - ensure that deprecation warnings are shown during tests

refs #18985
[1.5.x] Skipped deprecation warning test on Python 2.6

Refs #19546. On Python 2.6, DeprecationWarnings are visible by
default.
Backport of e6949373b from master.
[1.5.X] Fixed lockups in jenkins, refs #19546.

Backport of ce580dd8ea04237cfe34cd02df0b8944a5345f4f from master.
[1.5.x] Fixed #19586 - Removed URL_VALIDATOR_USER_AGENT from setting docs.

It was removed in Django 1.5, not deprecated.

Backport of 066cf2d70e from master
[1.5.x] Addeded CSS to bold deprecation notices.

Thanks Sam Lai for mentioning this on the mailing list.

Backport of 227bd3f8db from master
[1.5.x] Fixed #19573 -- Allow override of username field label in AuthenticationForm

Backport of cdad0b28d from master.
[1.5.x] Fixed #19588 - Added create_superuser to UserManager docs.

Thanks minddust for the report.

Backport of 4da5947a87 from master
[1.5.x] Fixed #10239 - Added docs for modelform_factory

Thanks ingenieroariel for the suggestion and slurms for the review.

Backport of 71d76ec011 from master
[1.5.x] Fixed #19437 - Clarified pip install instructions in contributing tutorial.

Backport of 9f9a7f03d7 from master
[1.5.x] Fixed #19585 -- Fixed loading cookie value as a dict

This regression was introduced by the 'unicode_literals' patch.
Backport of f08e739bc2 from master.
[1.5.x] Fixed #19488 -- Made i18n_patterns redirect work with non-slash-ending paths

Thanks Daniel Gerzo for the report and the initial patch.
Backport of bcdb4898c from master.