Author an empty commit indicating that the repo was exported

[GoogleCodeExporter]

It would be nice if there were a record that the repository was exported from 
Google code. Something like this:

    git commit --allow-empty --author="Support Tools <none@example.org>" \
        -m "Export from Google Code" \
        -m "Project exported from Google Code on 2015-04-02" \
        -m "Originally available at https://code.google.com/..."

Original issue reported on code.google.com by sircm...@gmail.com on 2 Apr 2015 at 9:06