Highlight: Rebar to manage plugin dependencies.

Highlight: [Stomp]() and [SockJS](https://github.com/emqtt/emqttd_sockjs) Plugins!

Improve: add rel/files/emqttd.config.development|production.

Improve: persist mnesia schema on slave nodes.

Improve: use timer:seconds/1 api.

Improve: The binary release will be compiled with R18.1 now.

Bugfix: issue#310 - usage of emqttd_ctl error: ‘session list’ should be ‘sessions list’

Bugfix: issue#311 - ‘./bin/emqttd_ctl sessions list’ error

Bugfix: issue#312 - unsubcribe will lead to crash if emqttd_plugin_template plugin loaded