Started implementing ByteArray message handling in the daemon
Refactored messages to be sent/received as byte arrays

- Moved rfidNumber field to superclass Message, will be present
   but optional in every message
- Created MessageType enum, represented as int values
- Changed ResponseLogic hard-coded CurrentConsumptionMessage to match new constructor
Small fix in index.html, missing p tag
Merge branch 'master' of https://github.com/clascelles/CEG_4912_cerberus_system