uninstall via npm, downgrade winston-syslog, refactored deleteAdapter, object.json auto-backups

1.4.0 (2018-04-03)

Main changes: uninstall via npm, downgrade winston-syslog, refactored deleteAdapter, object.json auto-backups

• (AlCalzone) fix npm version pre-install check
• (bluefox) remove winston-syslog 2.0 and replace it with 1.2.6
• (AlCalzone) refactored and promisified deleteAdapter and deleteInstance
• (bluefox) remove controller from the adapters list in admin
• (bluefox) also uninstall adapters using npm
• (bluefox) backup object.json files every 2 hours for last 48 hours (warning! Disk usage)
• (bluefox) added cli command to update/add the vis/knx license