Summary: - Track + message through file moves. - Stop + message on file create. - Stop + message on first commit. Test Plan: - Tested blaming through a move, through a create, and through the first commit. - Verified this doesn't break anything in SVN / Mercurial. Reviewers: vrana, btrahan, jungejason Reviewed By: btrahan CC: aran Maniphest Tasks: T1091 Differential Revision: https://secure.phabricator.com/D2295