Updated the package to v 3.0, including data/, man/, inst/scripts/, DESCRIPTION and NEWS

TODO: data/LahmanData must be updated
TODO: try to fix CRAN nag NOTES re: no visible binding in the convenience functions

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lahman@45 edb9625f-4e0d-4859-8d74-9fd3b1da38cb