Adding argparser to nightly_build.py in addition to minor updates

Created by: Thomas-J-Kidd

nightly_build.py got a makeover through adding logger and argparser. I continued to add try and except statements to help prevent crashes and no error logging.

argparser now allows you to specify path, repository, which tests to make, and to send an email or not.

I edited the README.md to show how to add a cronjob

I updated the wrapper script to match the new argparser functionalities.

Please squash my commit because some of them are old and reverted.