R1:ef990703fa3b

Fix SVN commit change parser for directories copied from the same path

Summary: See [[ https://secure.phabricator.com/D2215?id=3773#inline-2451 | D2215#inline-2451 ]].

Test Plan: Reparsed commit which was wrong, now correct.

Reviewers: epriestley, jungejason

Reviewed By: jungejason

CC: aran

Differential Revision: https://secure.phabricator.com/D2232