sensor add!!!!!

	modified:   home.py
	modified:   lib/command/Command.py
	modified:   lib/command/CommandParser.py
	new file:   lib/helper/SensorHelper.py
	modified:   lib/helper/SwitchHelper.py
	new file:   sensor_server.py
	modified:   usr/callbacks/action/action.py
	modified:   usr/callbacks/target/target.py
	modified:   usr/init.json