Fix heart-beating
Fix heart-beating

If heart-beating is specified in the connect headers, store it in
clientHeartBeat property.

Do not start pinger or ponger if their TTL is 0.

devTransition/StompKit,buffpojken/StompKit,rguldener/WebsocketStompKit,tommylitang/StompKit,nedap/WebsocketStompKit,mishaehs/StompKit,tbowers/StompKit,devTransition/StompKit,maxcampolo/StompKit,mobile-web-messaging/StompKit