Added generic class for holding system values.
Converted Power manager to begin using this class.

	modified:   Logger.h
	modified:   Makefile.am
	modified:   Makefile.in
	modified:   PowerManager.cpp
	modified:   PowerManager.h
	new file:   Value.cpp
	new file:   Value.h
	new file:   Voltage.cpp
	new file:   Voltage.h
	modified:   main.cpp
Changed Motor to use the new Value class framework

	modified:   Motor.cpp
	modified:   Motor.h
	modified:   SubControl.cpp
Merge branch 'motor_json'