Updated release properties and download page.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1644188 13f79535-47bb-0310-9956-ffa450edef68
Updated index page regarding current alpha release.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1644189 13f79535-47bb-0310-9956-ffa450edef68
Updated release notes.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1644190 13f79535-47bb-0310-9956-ffa450edef68