Add google analytics tracking

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1620430 13f79535-47bb-0310-9956-ffa450edef68
Add a htaccess redirect from tourdeflex/explorer.html to tourdeflex/index.html

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1620437 13f79535-47bb-0310-9956-ffa450edef68