Run ApnsFeedback only on Apns apps.

[robertasg]

Currently, ApnsFeedback tries running on every added application, including GCM for example. This results in a crash due to incompatible interfaces.

[amaierhofer]

I do not think this is necessary.

Rpush::Apns::App.all already ensures that only Apns apps are considered when starting the Feedback Receiver.

[robertasg]

Not on Redis. On Redis every App is on the same namespace defined in Rpush::Client::Redis::App.
Perhaps this can be solved with a different approach, eg. using different namespaces throughout the different apps to be more consistent.

[amaierhofer]

Ahh I see, it's all legit :)

I would appreciate if you could rebase onto master, add a comment explaining that this is necessary when using Redis and add a line to the changelog file.

[amaierhofer]

Great! Many thanks!