NicosKaralis/pushmeup — pull request #21 by rociiu (2013-12-26 11:20:09+00:00)
Title: add content-available key the APNS

https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/ApplePushService.html#//apple_ref/doc/uid/TP40008194-CH100-SW9
it's another option that support in pans