python3 version of exercise 1-1 + unit testing
python3 version of exercise 1-3 + unit testing
python3 version of exercise 1-2 + unit testing
minor newline change
python3 version of exercise 1-4 + unit testing
python3 version of exercise 1-5 + unit testing
python3 solution of 1-6 + unit testing
Merge pull request #27 from faif/master

python3 version solutions of 1-1 to 1-6 + unit tests