python wrapper for powershell scripts

[brian-olson]

Adding the wrapper from the grr-users group for archival sake. Thanks for sharing!

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[brian-olson]

I signed it!

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[grrrrrrrrr]

Hey Brian,

Thanks for the PR, sorry we somehow overlooked it :(

Do you still want to get this in? Two things, first a nit, could you please trim the lines to 80 chars?
Then, the waiter doesn't do anything it could be completely removed. You probably want to call Progress once a second but you are missing that call. Let me know if you want to fix this example!