[MSITE-683] add support for Maven 3.1/Eclipse Aether in addition to Maven 3.0/Sonatype Aether (through maven-reporting-exec 1.1)

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1461431 13f79535-47bb-0310-9956-ffa450edef68