switch to using argparse module for command line arguments.  Also removed
help message from __main__ because it wasn't needed anymore with argparse.
Lastly, switched from #!/usr/bin/python to #!/usr/bin/env python so that
user's preferred python will be used, instead of whatever version is in
/usr/bin/python.
Merge pull request #13 from nlchap0/master

switch to using argparse module for command line arguments.  Also remove...