laravel/framework — pull request #4254 by joychao (2014-04-26 01:19:23+00:00)
Title: update column values when the model increment or decrement

update column values ​​when the model increment or decrement:

```php
$post = Post::find($id);//view_count:1
$post->increment('view_count');
var_dump($post->view_count); //view_count: 2
```