Bugfix and Enhancements
Add a new listener for HTTP REST API (emqttd#1094)
Fix the race condition issue caused by unregister_session/1 (emqttd#1096)
Fix the issue that we cannot remove a down node from the cluster (emqttd#1100)
Passed org.eclipse.paho.mqtt_sn.testing/interoperability tests (emq_sn#29)
Fixed the issue that send http request and return non-200 status code, but AUTH/ACL result is denied (emq-auth-http#33)
Fixed the issue that fail to stop listener (emq_stomp#24)
Support using systemctl to manage emqttd service on CentOS