Multi-author

Fix multi author always true when read from .env

Multi author support

Features added:

• authors can manage their own address from the ghost admin panel

Multi author major

Major release for latest tag

First alpha release

Features:

• global IOTA listening address with MQTT
• user payment notification using socketio
• fetch content and style over ghost API
• internal session exiration handling
• persistence of payed user hashes with expiration