Added Joda-Time library to handle dates and times (instead of JDK's Date
and Calendar classes)
Created Message abstract class and sub-classes for all our different
messages.
	- RFID Authentication Request and Response
	- Current Consumption
	- Status
Created enums for the message type and status type
Externalized log file name as a static variable (should be configurable)
Merge branch 'master' of https://github.com/clascelles/CEG_4912_cerberus_system.git