Minor polishing on history widget. git-svn-id: http://google-refine.googlecode.com/svn/trunk@15 7d457c2a-affb-35e4-300a-418c747d4874
git-svn-id: http://google-refine.googlecode.com/svn/trunk@13 7d457c2a-affb-35e4-300a-418c747d4874
git-svn-id: http://google-refine.googlecode.com/svn/trunk@7 7d457c2a-affb-35e4-300a-418c747d4874