fixing variable typo in drupal8 entry

in the drupal 8 blog entry on the silex code snippet was $version transfered and $name used
use escape method from $app in the closure

the closure for $app->get got the $app itself passed, but it was never used, so either remove the use($app) or use $app, i decided for using $app and its escape method
Merge pull request #12 from paschdan/patch-1

fixing variable typo in drupal8 entry