How to use imagine ( crop, thumb, effects for images ) on Yii2

Comparing #12 with #13

Content

[...]
Image::thumbnail('@webroot/img/test-photo.jpg', 120, 120)
->save(Yii::getAlias('@runtime/thumb-test-photo.jpg'), ['quality' => 80]);
```

### Resizing and Preserving Aspect Ratio
 
 
 
 
```php 
use yii\imagine\Image;
 
use Imagine\Gd;
 
use Imagine\Image\Box;
 
use Imagine\Image\BoxInterface;
 
 
Image::getImagine()->open($fileName)->thumbnail(new Box($newWidth, $newHeight))->save($savePath , ['quality' => 90]);
 
 
 
 
```
 
 
### Effects
[More effects](https://imagine.readthedocs.org/en/latest/usage/effects.html "More effects")

#### Grayscale
[...]