Center Pivot 3D

I created this script to do automated pivot point centering.

Beeing a media engineering student located in Germany I just started out with python programming, so if you find any errors or have suggestions to improving the script please let me know in the comments.

Also I would welcome any feedback on improving the coding style.

I have used and tested the script only on Nuke 7 on Windows. Please share your experiences with other versions and operating systems.