minor spelling/grammar corrections
Updated CSRF middleware reference
Update RouteServiceProvider.php

Removed the CSRF provider as it is specified in the Kernel.
Prevent TokenMismatchException for HTTP OPTIONS requests

`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.
Merge pull request #3112 from nblackburn/patch-1

Updated CSRF middleware reference
Merge pull request #3118 from miclf/patch-1

Prevent TokenMismatchException for HTTP OPTIONS requests
Tweak wording.
Merge pull request #3108 from pascalschwientek/patch-1

minor spelling/grammar corrections
Fix redirects.
Fix file.
Terminate the request after sending.
Remove some stuff from .gitignore.

Let people define their own global .gitignore file. Also people keep
complaining that composer.lock is in this file.
Rename traits.
Rename.
Bootstrap the application when testing.
Use the console kernel.
Check type of token.
Update middleware list.
modify contract.
Update middleware.