logical op added !!

	modified:   home.py
	modified:   lib/command/Command.py
	modified:   lib/command/CommandParser.py
	modified:   lib/helper/SwitchHelper.py
	modified:   lib/model/Elements.py
	modified:   usr/callbacks/__init__.py
	modified:   usr/callbacks/action/action.py
	modified:   usr/callbacks/delay/delay.py
	new file:   usr/callbacks/logical/__init__.py
	new file:   usr/callbacks/logical/logical.py
	modified:   usr/callbacks/target/target.py
	modified:   usr/init.json
	modified:   usr/stopwords.txt