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

Comparing #11 with #13

Content

[...]
```php
"yiisoft/yii2-imagine": "*"
```

to the require section of your composer.json. and run:
 
 
 
```php 
php composer.phar update
 
```
 


Examples of use
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```

### 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
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