Create turtle.py

Copy of the turtle mode source code for Python 2.6.6

```bash
> python
Python 2.6.6 (r266:84292, Feb 22 2013, 00:00:18)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import turtle
>>>
>>> turtle
<module 'turtle' from '/usr/lib64/python2.6/lib-tk/turtle.pyc'>
```