v1.4.0

• Added CSV Item import (including adding new suppliers & categories) and bulk delete for items, suppliers and categories.
• Added registration info and data management functions to POS terminal settings. These include offline sales backup, local settings reset, de-registration and data wipe.
• Added session timeout check to admin panel and session lock to POS terminal.
• Added option to allow negative sales items in the POS terminal.
• Updated socket.io/elephant.io libraries and added node.js port & proxy configuration to admin panel utilities. Improved websocket authorisation mechanism to handle server restart.
• Improved POS terminal status icon. It now includes websocket status and data received indication.
• Updated Datatables library and added DT responsive design plugin all admin panel tables.
• Replaced mysql export library with a PDO compatible version.
• Added compatibility for mysql 5.7 and php7