Merge branch '5.0' into 5.1

* 5.0:
  [Console] fix reading from STDIN

src/Symfony/Component/Console/Helper/QuestionHelper.php

@@ -107,7 +107,7 @@ class QuestionHelper extends Helper
     {
         $this->writePrompt($output, $question);
 
-        $inputStream = $this->inputStream ?: fopen('php://stdin', 'r');
+        $inputStream = $this->inputStream ?: STDIN;
         $autocomplete = $question->getAutocompleterCallback();
 
         if (null === $autocomplete || !self::$stty || !Terminal::hasSttyAvailable()) {