Updated to p-u .20

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632876 13f79535-47bb-0310-9956-ffa450edef68
prepare release

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632925 13f79535-47bb-0310-9956-ffa450edef68
move download files to site-docs

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632927 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release maven-plugins-26

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632928 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632930 13f79535-47bb-0310-9956-ffa450edef68
remove rat profile for release

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1632938 13f79535-47bb-0310-9956-ffa450edef68