The Last Maintenance Release for EMQ 2.0, and support to build RPM/DEB Packages.

Create the emq-package project: https://github.com/emqtt/emq-package

emq-auth-http#9: Update the priv/emq_auth_http.schema, cuttlefish:unset() if no super_req/acl_req config exists

emq-auth-mongo#31: cuttlefish:unset() if no ACL/super config exists

emq-dashboard#91: Fix the exception caused by binary payload

emq-relx#21: Improve the binemqttd.cmd batch script for windows platform

emqttd#873: Documentation: installing-from-source

emqttd#870: Documentation: The word in Documents is wrong

emqttd#864: Hook 'client.unsubscribe' need to handle 'stop'

emqttd#856: Support variables in etc/emq.conf: {{ runner_etc_dir }}, {{ runner_etc_dir }}, {{ runner_data_dir }}