Add \shortcites{janus} so that the Google paper with ~8 authors just
shows up as authorOne, et al, per the jss.pdf style guide.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@812 edb9625f-4e0d-4859-8d74-9fd3b1da38cb