Copy/Move directory fix

Hi,

I just created a pull request to fix the issues regarding
moving/copying directories.  The link is below.  If anyone interested
in getting this fix in to master, please take a look at the diffs in
question and see if they look ok.  Feel free to leave any relevant
comments on the pull request.

https://github.com/nant/nant/pull/39

Thanks in advance,
Ryan

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