Create luceneIndex directory in workspace's cache dir. git-svn-id: http://google-refine.googlecode.com/svn/trunk@1091 7d457c2a-affb-35e4-300a-418c747d4874
git-svn-id: http://google-refine.googlecode.com/svn/trunk@1077 7d457c2a-affb-35e4-300a-418c747d4874