Added ending section with Exercise instructions.
Added ending section with Exercise instructions.

Using the hands-on section.

5x5x5x5/ReproTutorial,reproducible-research/scipy-tutorial-2014,5x5x5x5/ReproTutorial,5x5x5x5/ReproTutorial,reproducible-research/scipy-tutorial-2014,reproducible-research/scipy-tutorial-2014