The new ApnsPHP is pretty annoying to work with inside our notification structure in the end...

see http://reviews.lunr.nl/r/447/ as well for the response class
It's not straightforward to define the status of the push for each endpoint:

- the library only returns an error structure (in a weird format...) for the endpoints with a failure

- some invalid endpoints are detected early on before the push and we don't get them as part of this report (because they are detected in a different Message class)

- we can then assume that the notification was delivered successfully to the endpoints left

unit tests