Remove unnecessary pusher:ping event handling
Remove unnecessary pusher:ping event handling

This will never be sent by the server since the WebSocket draft in use supports native pings

andreaperizzato/libPusher,alignd/libPusher,hamchapman/libPusher,lukeredpath/libPusher,andreaperizzato/libPusher,LoyoChengdu/libPusher,LoyoChengdu/libPusher,andreaperizzato/libPusher,lukeredpath/libPusher,LoyoChengdu/libPusher,hamchapman/libPusher,alignd/libPusher,alignd/libPusher,andreaperizzato/libPusher,hamchapman/libPusher,alignd/libPusher,lukeredpath/libPusher,lukeredpath/libPusher,hamchapman/libPusher,LoyoChengdu/libPusher