Merge branch '2.8' into 3.0

* 2.8:
  fixed issue with PHP 5.3
  The WebProcessor now forwards the client IP
  minor changes
  [symfony#17878] Fixing a bug where scalar values caused invalid ordering
  [symfony#17724] Fixing autowiring bug where if some args are set, new ones are put in the wrong spot
  bumped Symfony version to 2.3.39
  updated VERSION for 2.3.38
  update CONTRIBUTORS for 2.3.38
  updated CHANGELOG for 2.3.38

Author: fabpot