managed 404 error page

creata la gestione dell'errore 404 con relativa pagina da template
Merge remote-tracking branch 'origin/master'

Conflicts:
	app/database/migrations/2014_06_26_154715_create_users_table.php
	vendor/autoload.php
	vendor/composer/autoload_classmap.php
	vendor/composer/autoload_real.php