added a small run.py script to help out to run the scripts in examples folder in case you have the whole source tree of pymunk and dont want to install it or put the pymunk folder inside the examples folder.
added a small run.py script to help out to run the scripts in examples folder in case you have the whole source tree of pymunk and dont want to install it or put the pymunk folder inside the examples folder.

git-svn-id: 4658502d6a5631d0681d7730b53f9627060b5bd8@363 78f3efd8-5644-0410-8aa8-f3833044bd4a

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