Fix getting real IP address of requester.
Fix crash issue when request's app name header is unknown.
Fix crash issue on error handler by not calling render method on response object. App doesn't have a view layer.
Fix sending notifications to multiple users.
Implement passing message and userIds parameter as just string instead of object.
[PushController] No need to get the app's push service on each iteration.
Merge pull request #1 from dgurkaynak/master

Bug fixes
Implement sending a payload with the push message.