"""

(optional)
Task 6: 
Decorators  http://python-textbok.readthedocs.io/en/1.0/Functions.html#decorators  
exercise: http://python-textbok.readthedocs.io/en/1.0/Functions.html#exercise-6

Exercise 6
Rewrite the log decorator example so that the decorator logs both the function name and parameters and the returned result.
Test the decorator by applying it to a function which takes two arguments and returns their sum. Print the result of the function, and what was logged to the file.
"""
