Exercise 4.12.3 pep8 cleanup.
Exercise 4.12.4 pep8 cleanup.
Exercise 5.14.1 pep8 cleanup.
Created Exercise 13.6.py. Create a program and find out how many words are not found in our words file (stored as a dictionary) via set subtraction.
Changed mode to be executable.
Altered length of text to be less that 80 chars on comment line.
Merge branch 'pep8-cleanup.'