+ add node-zookeeper-client module; add scripts/createZKMasterNode.js
* make createZKMasterhaNode.js, startMasterhaNode.sh executable
* use pomelo-masterha-plugin@0.0.3
* use pomelo-masterha-plugin@0.0.4
* give chat/path-server a auto-restart property
* del chat-server auto-restart property
* disable masterhaPlugin; del "auto-restart" property of path-server
* enable masterhaPlugin