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
Yes, that must be a bug on higher level. I got he following error: "TypeError: str does not support the BufferIO" or so