Control checkbox in the preview window.

Revert "Fixes #3469: Fixed the bug that `QueryBuilder::getColumnType()` may drop the provided column precision in certain cases"

This reverts commit a46efe79.

This reverts commit 70b57766.

Fixes #3469: Fixed the bug that `QueryBuilder::getColumnType()` may drop the provided column precision in certain cases

* 'migrate-command-enhancement' of https://github.com/creocoder/yii2:
  MigrateController refactoring
  CHANGELOG fixed
  Comments updated
  CHANGELOG updated
  MigrateCommand enhancement. `all` option added for `down` action.

Conflicts:
	framework/CHANGELOG.md

Update various typos and grammar

Small changes according to the class reference

[travis-ci] Allow fast finishing

It looks like this values are supposed to be in different order due to the class reference and practice.

Fixes #3458: Fixed the bug that the image rendered by `CaptchaAction` was using a wrong content type

changed comments #3446

fixes #3438

fixes #3431

Fixed the issue that `ServiceLocator` still returns the old component after calling `set()` with a new definition