Request::overrideGlobals() may call invalid ini value

According to http://php.net/manual/ja/ini.core.php ,
there's not variable_order, but variables_order (with trailing "s").

Perhaps it breaks BC for some developer who unsets
'request_order' ini value and sets 'variable_order' manually?
Merge branch '2.2' into 2.3

* 2.2:
  bumped Symfony version to 2.2.11
  updated VERSION for 2.2.10
  update CONTRIBUTORS for 2.2.10
  updated CHANGELOG for 2.2.10
  fixed version
  Request::overrideGlobals() may call invalid ini value
  Force Luhn Validator to only work with strings
  [Translation] fixed the error in the dumper test as described in #9475
  [Console] fix phpdoc and constructor default value

Conflicts:
	src/Symfony/Component/Console/Helper/ProgressHelper.php
	src/Symfony/Component/HttpKernel/Kernel.php