Allow for Symfony 2.4
Merge pull request #12 from tobiassjosten/symfony-2.4

Allow for Symfony 2.4
Add support for the 'type' key on the message recipients array
Merge pull request #14 from rjelierse/master

Add support for the 'type' key on the message recipients array
Merge remote-tracking branch 'upstream/master'
Merge branch 'refs/heads/master' into feature/subaccount