Updated releases section on overview page.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/beanutils/trunk@1555950 13f79535-47bb-0310-9956-ffa450edef68
Switched to version 1.9.1 in menu.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/beanutils/trunk@1555951 13f79535-47bb-0310-9956-ffa450edef68
Added a description for 1.9.1 release.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/beanutils/trunk@1555952 13f79535-47bb-0310-9956-ffa450edef68