[MERGE] Speed up diff spec handling.

[Aaron Bentley]

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Hi all,

This patch speeds up diff's handling of revision specs by using the new
as_revision_id method.

Unfortunately, I discovered (due to test failures) that the
_as_revision_id implementation of the branch: spec was broken-- it
doesn't do a fetch, to ensure that the revision is present in the local
branch.  But it also doesn't provide a different branch location, to
retrieve the spec from.  Which means that it can provide a revision_id
that the caller cannot use.

So I changed it do use fetch, as the current implementation does.  I
agree that using fetch should no longer be necessary, but that can be
fixed as a separate thing.

There are no tests, since this is an optimization, not a behavior change.

Aaron
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