Use PHP 5.4 Closures $this Where Safe To

PHP 5.4 supports $this in closures, and as laravel 4.2 is targeting it, we might as well use it, or rather, not use it, if you get what I am saying. I have got rid of some of the `$me = $this;` stuff from the closures that don't need it because we are use that $this will be the correct object.