Version 0.8.0

• Add zip, xml, mbstring and soap PHP modules.
• Install docker-engine and docker-compose.
• Raise required Vagrant version to 1.8.
• Use boxcutter/ubuntu1604 as base-box.
• Optimize package-installation process.
• Update Node.js to version 6.0.x.
• Remove duplicated SERVER_NAME env-variable from Nginx configuration.
• Remove some obsolete PPAs.