updated CHANGELOG for 2.3.12
update CONTRIBUTORS for 2.3.12
updated VERSION for 2.3.12
bumped Symfony version to 2.3.13
updated CHANGELOG for 2.4.3
updated VERSION for 2.4.3
bumped Symfony version to 2.4.4
Merge branch '2.3' into 2.4

* 2.3:
  bumped Symfony version to 2.3.13
  updated VERSION for 2.3.12
  update CONTRIBUTORS for 2.3.12
  updated CHANGELOG for 2.3.12

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
Merge branch '2.4'

* 2.4:
  bumped Symfony version to 2.4.4
  updated VERSION for 2.4.3
  updated CHANGELOG for 2.4.3
  bumped Symfony version to 2.3.13
  updated VERSION for 2.3.12
  update CONTRIBUTORS for 2.3.12
  updated CHANGELOG for 2.3.12

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
[VarDebug] Symfony debug extension
[VarDebug] a README for the debug extension
[VarDebug] algo to clone any PHP variable to a breadth-first queue
[VarDebug] symfony_debug ext. fast and memory efficient cloning algo
[VarDebug] add casters for per class/resource custom state extraction
[VarDebug] casters for exceptions representation
[VarDebug] casters for SPL data structures
[VarDebug] casters for PDO related objects
[VarDebug] casters for removing the entity manager from Doctrine proxies
[VarDebug] interface for dumping cloned variables
[VarDebug] CLI dedicated dumper and related abstract