Fixed typo [ci skip]

singular is more suited to
change to "check out"
e-mail => email, and subject/verb agreement
add punctuation
Remove duplicate configuration option for ActiveSupport [ci skip]

Fixes rails/rails#13732
`requies` => `requires`
`easiy` => `easy`
`framwork` => `framework`
Remove old comments about suppressing warnings.
Upgraded jquery-rails gem version
update contribution doc grammar. [ci skip]

- Manually applied from #13951.
- Discussion at #13947.
- Removed trailing whitespace from https://github.com/dpmehta02/rails/commit/18044e86af93672dfc38befbe974261e87b3518d

/cc @dpmehta02
synchronize 4.1 release notes with CHANGELOGS. [ci skip]

/cc @chancancode
docs, Associations also raise on name conflicts. [ci skip]

Follow up to https://github.com/rails/rails/commit/580f0b61dc99c6854fa930a761d28a3ab08163f7#commitcomment-5293470
Add config to disable schema dump after migration

* Add a config on Active Record named `dump_schema_after_migration`
* Schema dump doesn't happen if the config is set to false
* Set default value of the config to true
* Set config in generated production environment file to false
* Update configuration guide
* Update CHANGELOG
Merge branch 'dump-schema-after-migration-flag' of git://github.com/emilsoman/rails into emilsoman-dump-schema-after-migration-flag

Conflicts:
	activerecord/CHANGELOG.md
Tests that skips a controller filters that was set up using a class
Merge pull request #13962 from iwiznia/test_controller_skip_action_class

Test for skipping a controller filter set up with a class Part 3
Fixed spelling error: `extracetd` => `extracted`
Fix wordy sentence
Merge pull request #13968 from kintamanimatt/fix-wordy-sentence

Fix wordy sentence [ci-skip]