Added Python3 support. Now Python 2 or 3 can be used with the same code

The code is runnable with Python3 and Python2 now. Tested with Python 2.7 and Python 3.3.
Please write code in the future for Python 2 and 3, so both are supported
also, if you use irc, we could talk there.

I usually hang out on e.g. #moin on chat.freenode.net.