Prevent TokenMismatchException for HTTP OPTIONS requests

Updated CSRF middleware reference

fix php artisan serve functionality with hardcoded values

new logout-method naming

`OPTIONS` HTTP requests should be treated in the same way than `GET` requests by the `VerifyCsrfToken` middleware. Otherwise, an exception is thrown, thus preventing any `OPTIONS` route to work.

Removed the CSRF provider as it is specified in the Kernel.

Fixing php artisan serve functionality

Rename Gulpfile.js to gulpfile.js

Fixed RouteServiceProvider docblocks