increased version number to 1.8.1
increased version number to 1.8.1

git-svn-id: ec0e82f20d5f43f30b1ff61070d3821b1abb3ae2@23 d42a221a-af4f-11dd-872e-17ce28d58b44

pib/chartfood,mentionllc/google-visualization-python