Fix the Y2K38 bug

Adds support for timestamps beyond year 2038.

Update yii.validation.js

Если длина строки не проходит валидацию, то выводим сообщение об этом, а не длину.))

Get gridview footer content after cells content

Gii missing space in crud update template [skip ci]

Fix exception hierarchy

InvalidCallException, InvalidParamException, UnknownMethodException are now extended from SPL BadMethodCallException

Fix typo

[ci skip] Update basics.md

I think, the correct form is `should be defined` OR `is defined`, but not `be defined`

Fixes #2837: Error page now shows arguments in stack trace method calls

Conflicts:
	framework/CHANGELOG.md

Fix typo

Updated data-grid.md to fix wrong path to GridView