Brought up in https://github.com/rails/rails/issues/9727

This reverts commit abba61e2.

Handle conditional get in live requests

Handle conditional get in live requests - this will prevent error when using stale on live streams(issue #9636)

MOAR cleanups of unused variables. 

Even though I read it carefully, my brain tricked me. 😢

Add documentation to ActionDispatch::Request

Rails 4 upgrade notes about clashing named route selection changes

Add support for generate scaffold password:digest

* adds password_digest attribute to the migration
* adds has_secure_password to the model
* adds password and password_confirmation password_fields to _form.html
* omits password from index.html and show.html
* adds password and password_confirmation to the controller
* adds unencrypted password and password_confirmation to the controller test
* adds encrypted password_digest to the fixture

* adds password_digest attribute to the migration
* adds has_secure_password to the model
* adds password and password_confirmation password_fields to _form.html
* omits password entirely from index.html and show.html
* adds password and password_confirmation to the controller
* adds unencrypted password and password_confirmation to the controller test
* adds encrypted password_digest to the fixture

rework passing headers and env variables in integration tests

Closes #6513.

Also:
cleanup, use consistent syntax for `Http::Header` and test.

Change from each to each_value in http/parameters since we don't use key

fix typo in Active Record CHANGELOG [ci skip]

The bug with `ActiveSupport::TimeZone.parse` described in #9678 was
unwittingly fixed in 005d9106 so add some tests to prevent regression.

removing out of date comment.  :heart::heart::heart::heart::heart::heart::heart::heart::heart::heart::heart::heart: @pixeltrix

Also quote extension name in disable_extension

A patch was committed recently which quoted the extension name in the SQL for `enable_extension`. But the same wasn't done for `disable_extension`.

Cache the value of "super" in a variable and use it instead.

dependent: :destroy should call destroy_all

Pass column to quote when copying a sqlite table.

To make quote escape binary data correctly it needs the column passed in.