Installation and Configuration Guide released on

Improve and Consolidate the design of Hook, Server, PubSub and Router

Upgrade the [Web Dashboard](https://github.com/emqtt/emqttd_dashboard) to support pagination

Bridge emqttd broker to another emqttd broker & emqttd to mosquitto bridge (#438)

./bin/emqttd_ctl: add ‘routes’ command

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Add ‘backend_subscription’ table and support static subscriptions (emqttd_backend)

Add ‘retained_message’ table and refactor emqttd_retainer module (emqttd_backend)

Add PubSub, Hooks APIs to emqttd module (emqttd)

Move start_listeners/0, stop_listeners/0 APIs to emqttd_app module (emqttd_app)

Add 100+ common test cases.

Upgrade Dashboard, Redis, Stomp and Template Plugins