added model binding.
Update src/Illuminate/Routing/Route.php

Small typo in comment
[Routing] Symfony changed the Route::setHostname() method to Route::setHost.  Commit Here https://github.com/symfony/Routing/commit/7196489720091b5bb70ef1866b7ff9719a98f761
some basic cleaning.
Merge remote-tracking branch 'origin/master'
test sub domain routing.
allow trailing slashes.