Changed the encoding specification from 'utf8' to 'UTF-8'

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/microdataes@21 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed encoding issues

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/microdataes@22 edb9625f-4e0d-4859-8d74-9fd3b1da38cb