Swagger: Output swagger description

[refererring to](https://github.com/mevdschee/php-crud-api/pull/210)

Hi there,

We're allmost there, I found 2 bug, one I solved by this pull request:

The first one: when deleting multiple rows at once and applying my soft delete [see example 209](https://github.com/mevdschee/php-crud-api/issues/209) I got an 404 errror : Subject cuased by the [updateObject method](https://github.com/mevdschee/php-crud-api/blob/master/api.php#L1533-L1535) 

The other you will find here [209](https://github.com/mevdschee/php-crud-api/issues/209), this needs to be discussed first.

Possible fix for issue 206

Possible fix for [issue 206](https://github.com/mevdschee/php-crud-api/issues/206)

soft delete example
```php
'before'=>function(&$cmd, &$db, &$tab, &$id, &$in) { 
	if ($cmd == 'delete') {
		$cmd = 'update'; // change command to update
		foreach($in as $k => $o) {
			$in[$k]->deleted = date('Y-m-d H:i:s', time());
		}				
	}
			
},
'column_authorizer'=>function($cmd, $db ,$tab, $col) { 
	return ( ! in_array($col, array('deleted')));
},
'record_filter'=>function($cmd,$db,$tab) { 
	return array('deleted,is,null');
}
```

after_create

A little bugfix.

Hi Maurits,

I needed a callback function that got triggered on a new db entry (Create).

For example I wanted to send an e-mail to a newly registered member.
In this example I have a "members" table with the columns: id , firstName, lastName, email
the yourEmailFunction method will send a welcome message to the newly entered member.

```php
$api = new PHP_CRUD_API(array(
   'after_create'=>function($db,$tab,$row) {
      if ($tab == 'members') 
         yourEmailFunction($row['firstName'],$row['lastName'],$row['email']);
      }
   }
));
$api->executeCommand();
```
Tell me you thoughts... maybe if you like it and willing to accept the pull request I can also create an after_delete and after_update method.