added ems() function by Jake Westfall

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@136 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updated author list and version bump

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/afe@137 edb9625f-4e0d-4859-8d74-9fd3b1da38cb