Updated link for PyMacAdmin

[benroeder]

https://code.google.com/p/pymacadmin/ ->https://github.com/nigelkersten/pymacadmin

[googlebot]

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[benroeder]

I signed it!

[googlebot]

CLAs look good, thanks!

[ccaviness]

Thanks for the pull request - can you update it to https://github.com/MacSysadmin/pymacadmin instead?

[benroeder]

Updated as requested and updated the munki link as well