updated version to 2.6
Merge branch '2.5'

* 2.5:
  [TwigBridge][Trans]set %count% only on transChoice
  [Debug] throw even in stacking mode to preserve code paths
  [Debug] preserve modified error level
  [DomCrawler] Fixed a forgotten case of complex XPath queries
  bumped Symfony version to 2.4.6
  updated VERSION for 2.4.5
  updated CHANGELOG for 2.4.5
  bumped Symfony version to 2.3.16
  updated VERSION for 2.3.15
  updated CHANGELOG for 2.3.15
Merge branch '2.5'

* 2.5:
  Revert "bug #10894 [HttpKernel] removed absolute paths from the generated container (fabpot)"
  Revert "bug #10937 [HttpKernel] Fix "absolute path" when we look to the cache directory (BenoitLeveque)"
  Revert "fixed CS"
  Revert "bug #10979 Make rootPath part of regex greedy (artursvonda)"
  Revert "[HttpKernel] simplified some tests"
  [HttpKernel] simplified some tests
  Make rootPath part of regex greedy
Merge branch '2.5'

* 2.5:
  Revert "bug #10908 [HttpFoundation] implement session locking for PDO (Tobion)"
[HttpFoundation] implement session locking for PDO
[Debug] enhanced error messages for uncaught exceptions
[Debug] generalized ErrorHandler
[Debug] update FrameworkBundle and HttpKernel for new ErrorHandler