PoFileDumper - PO headers
Merge branch '2.2' into 2.3

* 2.2:
  bumped Symfony version to 2.2.10
  updated VERSION for 2.2.9
  update CONTRIBUTORS for 2.2.9
  updated CHANGELOG for 2.2.9
  [Security] limited the password length passed to encoders
  assets:install command should mirror .dotfiles (.htaccess)
  PoFileDumper - PO headers
  removed whitespaces

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Security/Core/Encoder/BCryptPasswordEncoder.php