Fixes #143. UrlValidator and EmailValidator IDN support.

Form asset bundle registering code moved from ActiveForm::run() to the *Validator::clientValidateAttribute().

punycode.js asset bundle registering moved from ActiveField to validators.

Make multisort compatible with Sort

Test code
```php
$orders = $this->getSort()->getOrders();
ArrayHelper::multisort($data, array_keys($orders), array_values($orders));
```

Fixed issue with getting Object component

Fixes #226: atomic operations and transaction support in AR.