Increment version.
Change Auth::guest() to call the check() method.

Instead of reimplementing the logic of the Auth::check() method, we can call and negate it. This makes it easier to change things in a Guard subclass.
Merge pull request #2439 from franzliedke/patch-12

Change Auth::guest() to call the check() method.
Update Symfony dependencies to 2.4.*
Added 'input' method to Router.
Merging 4.0 branch into master.