APN feedback not connecting

[gamafranco]

Hi,

I try to use the APN feedback to get the invalid tokens, so that we can remove them from the database.

But this is what I get on the console in production:

irb(main):011:0>  feedback = APN::Feedback.new()
=> #
irb(main):004:0>  tokens = feedback.tokens
=> []

The server sends push with notify_sync and notify_async. So that is working.
There are invalid tokens on my database, so the array should not be empty.

Thanks.

[gamafranco]

The pull request above should fix it.