updated script event

**Important Notice: run `composer.phar self-update` first!**

Since this commit https://github.com/composer/composer/commit/4b22d7582aaceb13750d77559e02ed9a832495c3 we're able to use `composer.phar create-project` also in the development repository to bootstrap the application.
Furthermore `create-project` now triggers two new [script events](http://getcomposer.org/doc/articles/scripts.md#event-names) which only occur while running this command.