GitLab

- fixes an critical issue, where notifications for FCM devices where re-enqueued,
  even if the message was send successfully when a single notification failed to be send
- adds new dummy handler for debugging purposes

- introduces new multi handler pushing for a single message
- refactors APNS handler to use apples 'new' api.push.apple.com API
- improves error handling

- cleanup of docblock comments
- adds @method hints for PushNotification magic __call methods to internal Handlers

- now requires PHP 7.0 at least!
- adds title support for notifications in send() method

- sendRaw() allows to push raw payload without defaults and minimal
  preprocessing to servers

- fixes missing curl_close() in WNSHandler if an error appeared
- replaces Exceptions with more specific Runtime and UnexceptedValue
  Exceptions

- fixed typo in WNSHandler
- improved payload handling
- default payload is now array() instead of NULL
- some small changes in the readme.md

- added APNS Command 2 support to APNSHandler
- added support for arbitrary settings like priority, message-id and
  expiration-date to APNSHandler (partly only available for Command 2)