updated to make it work with latest stdeb (0.7.1)

On a newly installed Trusty machine neither Debian packages for Python 2 nor 3 worked for me. I tried the latest stdeb version from PIP with Python 2 as well as the old forked version 0.6.0 with Python3. This pull request captures the changes I had to make to this repo which uses the current version of stdeb (0.7.1) from either PIP (for Python 2) or from the new branch on my fork (for Python 3).