Release Date: 2015-04-24

Bugfix: critical issue #54, #104, #106 - error when resume session

Improve: add emqttd_cm_sup module, and use 'hash' gproc_pool to register/unregister client ids

Improve: kick old client out when session is duplicated.

Improve: move mnesia dir config from etc/app.config to etc/vm.args