Node.js logs should include timestamps

[mattheworiordan]

Got this whilst running some Node.js tests:

Ably: RealtimeChannel.notifyState: name = 1492774305244, current state = attaching, notifying state attached
Ably: RealtimePresence.onAttached(): channel = 1492774305244, hasPresence = false
Ably: RealtimePresence.onAttached: sending 1 queued presence messages
Ably: ConnectionManager.send(): sending event
Ably: Protocol.send(): sending msg; [ProtocolMessage; action=PRESENCE; channel=1492774305244; msgSerial=0; presence=[ [PresenceMessage; action=enter] ]]
Ably: Channel state for channel "1492774305244": attached
Ably: RealtimeChannel.onAttached: activating channel; name = 1492774305244
Ably: WebSocketTransport.onWsData(): data received; length = 246; type = object
Ably: Transport.onProtocolMessage(): received on web_socket: [ProtocolMessage; action=PRESENCE; id=mh2MAoIU2t:0; channel=1492774305244; channelSerial=e91VJNqQAA5uVb28282688:0; connectionId=mh2MAoIU2t; connectionSerial=0; timestamp=1492774304423; presence=[ [PresenceMessage; action=enter; id=mh2MAoIU2t:0:0; timestamp=1492774304423; clientId=testSuite; connectionId=mh2MAoIU2t] ]]
Ably: RealtimePresence.setPresence(): received presence for 1 participants; syncChannelSerial = undefined
Ably: WebSocketTransport.onWsData(): data received; length = 27; type = object
Ably: Transport.onProtocolMessage(): received on web_socket: [ProtocolMessage; action=ACK; count=1; msgSerial=0]
Ably: Protocol.onAck(): serial = 0; count = 1
Ably: MessageQueue.completeMessages(): serial = 0; count = 1

We should add in a timestamp to make this more useful

[SimonWoolf]

Fixed by 7845bba