Allow for string events

[LukeTowers]

String events are especially useful for passing custom data to the listener. Consider the following:

use Native\Laravel\Client\Client;
use Native\Laravel\Notification;

// Send a notification with a custom event
$client = new Client();
$notification = new Notification($client);

$articleId = 1;
$notification->title('EXTRA EXTRA READ ALL ABOUT IT')
    ->message('You should totally click this)
    ->event('notification.clicked.newArticle' . $articleId)
    ->show();

// Listen to the notification
Event::listen('notification.clicked.newArticle.*', function ($event) {
    $event = explode('.', $event)
    $articleId = array_last($event);
    // do stuff...
});

[LukeTowers]

@mpociot any feedback with this?

[simonhamp]

This seems fine to me. Thanks!