http://flarum.org/docs/extend/start/
That page for creating a new extension seems outdated. It talks about things like extension folder which doesn't exist anymore, and old naming conventions for extensions.
I have created simple bootstrap.php "Hello World" and composer.json, and put them in directory inside vendor just like the other third party extensions. I added entry to my composer.json in Flarum root folder and run "composer install". I however still can't see my new extension in Admin Dashboard.
Can someone help me create a basic "Hello World" extension in the new version of the Flarum?