[MERGE REVIEW] Use InventoryDirectory to represent tree root

[Aaron Bentley]

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John Arbash Meinel wrote:
> Actually, I think the above could be done as:
> entries = work_inv.iter_entries()
> entries.next()
> dir_cnt = sum(1 for path, ie in entries if ie.kind == 'directory')

> The rest of the changes look good to me.

Cool.  Submitted, with your first sum variant.

Aaron
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