move python_hard_learn to root directory.
Merge branch 'new' of github.com:wlong203/script-repo into new

Conflicts:
	python_hard_learn/ex14.py
	python_hard_learn/ex15.py
	python_hard_learn/ex15_sample.txt
	python_hard_learn/ex16.py
	python_hard_learn/ex17.py
	python_hard_learn/tmp.py