New Features

Shared Suscriptions (#639, #416):

mosquitto_sub -t '$queue/topic'
mosquitto_sub -t '$share/group/topic'

Local Subscriptions that will not create global routes:

mosquitto_sub -t '$local/topic'

Bugfix

Error on Loading emqttd_auth_http (#691)

Remove 'emqttd' application from dependencies (emqttd_coap PR#3)