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

Path was wrong

Fixes #3048: emphasized that sourcePath in asset bundle means "copy all the contents of it to the web/assets"

Fix BETWEEN and NOT BETWEEN conditions.

```
PHP Notice – yii\base\ErrorException

Undefined offset: 3

in .../yiisoft/yii2/db/QueryTrait.php at line 269
```

Typecast model Id so that urls don't break when using MongoDB object Id'...