in actionpack

RUNNING_UNIT_TESTS tweaks.

 #11288: Removed duplicated touching

Conflicts:
	activerecord/CHANGELOG.md

Remove actionview test duplication

Same test exists above 2 or 3 lines.

Extract common query to a constant.

Perf ref: https://gist.github.com/vipulnsward/8209749201dfdd678c97

Make HashWithIndifferentAccess#select always return the hash.

Hash#select! returns nil if the hash didn't change and thus behaves differently
from select, so it's return value can't be used as result for the latter.

Tidying "getting started" guide

Section "allowing the update of fields" was now just a general
introduction to the idea of the model (actual updating was two sections
later).  So, merged into the section about validation.

Adding back deprecation require in all.rb

`disable_implicit_join_references=` was only deprecated on `master`,
not with rails 4.0. We can remove it after 4.1

This reverts commit 3c719ead, reversing
changes made to d5c3bf97.

if belongs to model with touch option on touch

Closes #11288

Space is not required for Set-Cookie header

This reverts commit d108672d.

Conflicts:

	activesupport/CHANGELOG.md

Improve Getting Started Guide

Cleanup belongs to tests

removes markdown code markers from displaying in the active record querying guide [ci skip]

simplified logic to calculate number of queries by using assert_queries

Specify request method in guides [ci skip]

Added link to Form Helper article from getting strated [ci skip]

Remove deprecated `ActiveRecord::Base.disable_implicit_join_references=`

Removed unsued deprecation require

Removed deprecated `Rails.application.railties.engines`.