small changes in chapter "distributional regression", contact corrected

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@815 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
further families added

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@816 edb9625f-4e0d-4859-8d74-9fd3b1da38cb