Namespace in the component configuration

Hello!

I use in projects Composer to manage dependencies vendors and also for __autoload classes__.

I can use the namespace to create yii application:
```php
Yii::createApplication('\MyNamespace\WebApplication', $config)->run();
```

But can not use the namespace in the component configuration:
```php
'behaviors' => array(
     'mybehavior' => array(
         'class' =>  '\MyNamespace\Class',
     ),
 ),
```

I can not find a more elegant solution .. May have any thoughts?