change to Symfony >=2.3.0,<2.4.0
Merge branch 'master' into symfony-2.3

* master:
  use self.version for Kunstmaan Bundles
  Symfony 2.2 and Kunstmaan bundles 2.2.8.* dependency
  Update MediaManager.php
  Require correct FileHandler class
  fix add subform validation
  fixes_media
  tagging
  composer fix
  Update composer.json

Conflicts:
	composer.json
fix deprecated methods
$form->getAttribute is deprecated, use $form->getConfig()->getAttribute()
update doc
Merge branch 'symfony-2.3' of github.com:Kunstmaan/KunstmaanMediaBundle into symfony-2.3

* 'symfony-2.3' of github.com:Kunstmaan/KunstmaanMediaBundle:
  $form->getAttribute is deprecated, use $form->getConfig()->getAttribute()
  fix deprecated methods
Merge pull request #105 from Kunstmaan/symfony-2.3

Symfony 2.3