[MERGE] Define error for Repository.revision_tree()

[John Arbash Meinel]

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The attached patch adds some small tests that I found we were missing
for the Repository interface. Basically there was no definition of what
exception should be raised by Repository.revision_tree() if the
requested revision didn't exist.

Further, there were no tests of Repository.revision_trees(), so I added one.

In testing, we had a de facto error of RevisionNotPresent raised, since
that is what is raised by the underlying VersionedFile stores. I changed
it to NoSuchRevision, because it seemed like more of a Repository api.

If we don't prefer this, I can simply update the test to expect
RevisionNotPresent to be raised.

John
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