Added a set.seed call to the exprSet example to get reproducible results.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/oompa@193 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Wrote a first-draft of a vignette for the beta-binomial distribution, which serves to highlight its inclusion in the TailRank package.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/oompa@194 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Sigh.  If you add a new file, you have to remember to tell svn that you have done so.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/oompa@195 edb9625f-4e0d-4859-8d74-9fd3b1da38cb