Fix syntax error and remove duplicated test
Fix warning: & interpreted as argument prefix
Remove :yaml related tests and fix other related to parsing empty arrays

All Action Pack tests are green.
Merge pull request #8826 from acapilleri/different_target

Improved different_target conditions
Merge pull request #8823 from acapilleri/target_reflection_has_associated_record

Refactor target_reflection_has_associated_record?
remove 'update' duplications
Correcting the command 'rake rails:update:bin' in the release notes.[ci skip]
Merge pull request #8833 from diogomafra/release_notes

Correcting the command 'rake rails:update:bin' in the release notes. [ci skip]
Merge pull request #8824 from mjtko/fix/cookie-store-inheritance

Modify CookieStore middleware inheritance to avoid subclassing Rack::Session::Cookie [Fix for #7372]
Fix typo in deprecation warning
Merge pull request #8842 from nthj/patch-1

Fix typo in deprecation warning
Set default value to ActiveModel::Validator initializer attribute

Makes it easier to test its objects.
use multiline do-end blocks and rearrange definition for clarity
Merge pull request #8839 from mattdbridges/clarify_chdir

Clarify Dir.chdir definition
adding small mention one single line blocks in contributing to rails
[ci skip]
Merge pull request #8849 from mattdbridges/contributing_to_rails

Adding mention about single-line blocks in Contributing to Rails [ci skip]
Merge pull request #8848 from Irio/master

Set default value to ActiveModel::Validator initializer attribute
s/messqage/message/ in message_encryptor_test.rb
Merge pull request #8859 from tehgeekmeister/master

Fix a typo in a test.
adding start / finish on the instrumenter, adding tests for the class