fixing a bug where prompting for password in python 2.4 caused an error

python 2.4's getpass.getpass does not support the "stream" parameter, which okaara uses. This fix causes okaara to not pass an argument for "stream" in py2.4.

fixes #8
Merge pull request #10 from mhrivnak/mhrivnak-getpass24

fixing a bug where prompting for password in python 2.4 caused an error