Create fluent interface to EventManager

```php
$eventManager = new Manager();
$eventManager->updated = function() { // Add listener to the event "updated"
    echo 'Updated' . PHP_EOL;
);
$eventManager->updated(); // Dispatch event "updated"
```

```php
$eventManager = new Manager();
$eventManager->created = function($user) { // Add listener to the event "created"
    echo "Created [{$user->id}]{$user->name}\n";
);
$eventManager->created($user); // Dispatch event "created"
```