How do I SVN-commit multiple git-svn repositories simultaneously?
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I work at a company that tracks what could be viewed as multiple projects under one SVN repository.  Therefore, when I git-svn cloned said repository, I did it into multiple git-svn repositories.  However, sometimes it would be better to SVN-commit a single logical change that spans multiple projects.  Is there a way to do this?

For example, given the git-svn repositories:

- project-a => svn://svn.server/project-a
- project-b => svn://svn.server/project-b

I would like to be able to do `git svn dcommit-simultaneously project-a project-b` or something and have it commit only once to SVN.