Minor changes to date and vignette.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/htsfilter@70 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Removing Sweave.sty file.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/htsfilter@71 edb9625f-4e0d-4859-8d74-9fd3b1da38cb