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
  make the em accessible in the admin list configuration
  fix dbal export
  exportwithfiltersandsortparams
  export all entries that matches the current filtering, not only the 10 visible on the adminlist page
  tagging
  composer fix
  Update composer.json

Conflicts:
	composer.json
use SensioFrameworkExtraBundle version 2.3.*
updated doc
Merge pull request #71 from Kunstmaan/symfony-2.3

Symfony 2.3