fetch value(s) from stringified options

Conflicts:
	actionview/CHANGELOG.md
Merge pull request #11178 from JonRowe/fix_tags_picking_string_keys_from_non_stringified_options_for_4-0-stable

Fetch value(s) from stringified options in tags that stringify options, based of 4-0-stable.
Merge pull request #11161 from dmitry/find_in_batches_works_without_logger

ActiveRecord find_in_batches should work without logger

When I set logger to nil both methods from Batches module find_in_batches or find_each should work anyway.
Merge pull request #11163 from nfedyashev/omit_turbolinks_on_javascript_skip_option

Omit turbolinks configuration completely on skip_javascript generator option
Conflicts:
	railties/CHANGELOG.md
Merge pull request #11175 from robin850/patch-4

Update a broken link into the fixtures' template [ci skip]
Merge pull request #11176 from schneems/schneems/plugin_new_help_fix

Fix `rails plugin --help`
Conflicts:
	railties/CHANGELOG.md
fix typo in ActiveModel::Error docs [ci skip]
Using preferred find_by syntax in guides [ci skip]
Adding find_by in guide to methods that trigger after_find [ci skip]
Remove a duplicated section [ci skip]

Attachments were previously covered so remove the useless part. Just
move a note about multipart headers set when the mail method is
triggered to the kept section.
backport: linking small rails 4 features image to a bigger one [ci skip]

View a bigger version onclick
https://github.com/rails/rails/issues/11100
Remove unneeded require
Fix code example in Getting Started guide - fixes #11219 [ci skip]
Merge pull request #11232 from frodsan/fix_11219

Fix code example in Getting Started guide - fixes #11219 [ci skip]
Support array as root element in JSON
Add CHANGELOG entry for 1c9f9a2 [ci skip]
Merge pull request #11244 from ccarruitero/testing-guide

update test names in testing guide [ci-skip]
Merge pull request #11235 from frodsan/support_array_as_root_element_in_json

Support array as root element in JSON
fix to_sql output on eager loaded relations
Revert "fix to_sql output on eager loaded relations"

This reverts commit a9748da24a5643f012fa747c2b6aa957ac7c4ee2.