Optional annotation alias via use statement

Scenario:

Two annotations with same name registered:

``` php
Acme\Yoyodyne\NameAnnotation
Maslosoft\Mangan\NameAnnotation
```

Solution:

``` php

namespace Project\Vendor;

use Acme\Yoyodyne\NameAnnotation as AcmeName;

class MyClass
{
    /**
     * @AcmeName('foo')
     */
    public $conflicted
}
```

Use `UseResolver` for this feature.
