range-diff: Display new commits' diffs as well

[Kristian Amlie <kristian.amlie@xxxxxxxxxxxxx>]

At the moment brand new commits in range-diff are simply displayed on 
one line. However, I often find it useful to view diffs of new commits 
in addition to the altered diffs of the existing commits, since I'm 
interested in everything that was added. I could not find a flag to 
enable this, so currently I have to check these out separately.

Would there be interest in having a flag like, say --show-new-commits 
(and possibly even --show-old-commits) to enable this output?

Obviously dual-color would be somewhat redundant here, but the exact 
output can be discussed.

--
Kristian Amlie
Mender <https://mender.io>

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