quiz 4 and 5 of chap3
	new file:   exercises/chap3/__init__.py
	new file:   exercises/chap3/q0004.py
	new file:   exercises/chap3/q0005.py
	new file:   tests/chap3/__init__.py
	new file:   tests/chap3/q0004.py
	new file:   tests/chap3/q0005.py