Completed the following exercises
 Changes to be committed:
	deleted:    README
	new file:   ex10.py
	new file:   ex11.py
	new file:   ex12.py
	new file:   ex12.pyc
	new file:   ex13.py
	new file:   ex6.py
	new file:   ex7.py
	new file:   ex8.py
	new file:   ex9.py
Merge branch 'master' of https://github.com/bcbeidel/python