Removed compatibility code for streaming responses.

This code provided a deprecation path for old-style streaming responses.

Refs #6527, #7581.
Advanced deprecation warnings for Django 1.7.
Simplified description of HttpResponse(<iterator>)

Related to 8b9b8d3b.
Fixed #20677 - Typos in generic_inlineformset_factory docs.

Thanks Riley Strong for the report.
Merge pull request #1316 from ramiro/int_pk_pwd_reset
Report wrongly-typed settings and abort, as originally planned.

Thanks Claude for the heads up. Refs #12493 and commit 5e08b792.
Define the SessionStore inside __init__ instead of process_request

It's unnecessary to run this on every request, since technically, settings *should be* immutable.
Stopped calling loaddata with commit=False.

This was a stealth option only used by the tests, and it isn't useful
any more since `atomic` provides nested transactions.
Introduced getters for connection.autocommit and .needs_rollback.

They ensure that the attributes aren't accessed in conditions where they
don't contain a valid value.

Fixed #20666.
Removed a comment that wasn't adding a value.

In the intervening years, RelatedField has become less of a hack (though it still is one). Anyone who wants to can re-instate the comment, but please add more details.
Updated FAQ on Python versions to explain 2 vs 3.

Required the latest version for each Python series to minimize
bookkeeping in the future.

Forward-port of c1d8f3b from stable/1.6.x.
Stopped branding Python 3 support as experimental.

Forward-port of 0de21a6 from stable/1.6.x.
Bumped minimum Python version requirement to 2.7 in Django 1.7.
Removed some conditional code only needed under Python 2.6.
Fixed #20659 -- Fixed PublisherDetail in CBV topic documentation.

Thanks to tudor.prodan, susan, and Tim Graham for the report and reviews.
Fixed #20680 -- Deprecated django.utils.unittest.

Refs #19204.
Stopped using django.utils.unittest in the test suite.

Refs #20680.
Updated tests for deprecation of Option.get_(add|change|delete)_permission.

refs #20642.
Fixed a couple form/formset deprecation warnings in tests.
Removed tests for django.utils.unittest vs. unittest.

Silenced warnings caused by the deprecation of django.utils.unittest.

Thanks Preston Timmons and Carl Meyer for their advice.

Fixed #20680.