improved code styles #158 (#172)

* use php-cs-fixer instead of phpcodesniffer
* updated scrutinizer config
* adjusted code yules to all files
* updated CONTRIBUTING guidelines

src/Command/CreateUserCommand.php

@@ -59,7 +59,7 @@ class CreateUserCommand extends Command
     }
 
     /**
-     * @inheritdoc
+     * {@inheritdoc}
      */
     protected function configure()
     {
@@ -74,7 +74,7 @@ class CreateUserCommand extends Command
             ->addArgument(
                 'role',
                 InputArgument::OPTIONAL,
-                'A comma separated list of user roles, e.g. "'.$roles.'"',
+                'A comma separated list of user roles, e.g. "' . $roles . '"',
                 User::DEFAULT_ROLE
             )
             ->addArgument('password', InputArgument::OPTIONAL, 'Password for the new user (requested if not provided)')
@@ -82,7 +82,7 @@ class CreateUserCommand extends Command
     }
 
     /**
-     * @inheritdoc
+     * {@inheritdoc}
      */
     protected function execute(InputInterface $input, OutputInterface $output)
     {
@@ -92,7 +92,7 @@ class CreateUserCommand extends Command
         $email = $input->getArgument('email');
         $role = $input->getArgument('role');
 
-        if ($input->getArgument('password') !== null) {
+        if (null !== $input->getArgument('password')) {
             $password = $input->getArgument('password');
         } else {
             $password = $this->askForPassword($input, $output);
@@ -122,6 +122,7 @@ class CreateUserCommand extends Command
                     . $error->getMessage()
                 );
             }
+
             return;
         }