Added package date.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@243 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Changed description and details, needs fixing.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@244 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed typo in comments.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@245 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Citation added

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@246 edb9625f-4e0d-4859-8d74-9fd3b1da38cb