Completed exercises 14 to 21 of the Learn Python the Hard Way Tutorial
  Changes to be committed:
	new file:   ex14.py
	new file:   ex15.py
	new file:   ex15_sample.txt
	new file:   ex16.py
	new file:   ex17.py
	new file:   ex18.py
	new file:   ex19.py
	new file:   ex20.py
	new file:   ex21.py
	new file:   text.txt
	new file:   text2.txt