[Process] Do not redirect output to file handles when output is disabled
Merge branch '2.5'

* 2.5:
  PHP Fatal error when getContainer method of ContainerAwareCommand has be...
  [HttpFoundation] Fixed isSecure() check to be compliant with the docs
  Update MimeTypeExtensionGuesser.php
  fix test src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
  [Process] Do not redirect output to file handles when output is disabled
  [Validator] Fix array notation in the PropertyPath::append()
  Fixed undefined ImageValidator:: property when uploading an image during functional tests
  [HttpKernel] Fix event dispatcher dependency
  Fixed the Travis build on PHP 5.3.3