Laravel 5: Collective html not working (localhost)

I was trying to install laravel Collective form class as instructed in http://ift.tt/1NsyIda. I added the lines in provider and alias arrays. But it still returning error 'FatalErrorException in 35d2ebae68816953807290e20156144f line 7: Class 'HTML' not found'

full error

My installation commands-

My Composer.json file

My config->app.php file

via Chebli Mohamed