[MERGE] Fixes for 'bzr revision-info'

[Aaron Bentley]

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John Arbash Meinel wrote:
> I had a need to use 'bzr revision-info' and found that it was limited to
> only working in the current working tree. So the attached patch updates
> it to support '--directory' to supply any url, and not require a working
> tree.

I think we should follow the format of log and cat unless there's a good
reason to deviate.  revision-info currently takes a revision id as an
argument, but that's highly unusual.

Aaron
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