Python 3 support

```
I see that a Python 3 version is "next in line" [1].
Please only close this issue when it's done, s.t. I get notified per email.

[1] https://groups.google.com/forum/?hl=en#!topic/pythonxy/VxeyfJ1SY6E

```

Original issue reported on code.google.com by `robert.p...@mykolab.com` on 17 Sep 2014 at 8:35
