Added code to read the census

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/microdataes@11 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added the required metadata files to read the census

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/microdataes@12 edb9625f-4e0d-4859-8d74-9fd3b1da38cb