Bump the version for next development sprint

git-svn-id: https://svn.apache.org/repos/asf/buildr/trunk@1540247 13f79535-47bb-0310-9956-ffa450edef68
Update the download links

git-svn-id: https://svn.apache.org/repos/asf/buildr/trunk@1540248 13f79535-47bb-0310-9956-ffa450edef68
Register last release

git-svn-id: https://svn.apache.org/repos/asf/buildr/trunk@1540249 13f79535-47bb-0310-9956-ffa450edef68