updated parent pom and fixed errors reported by Checkstyle

git-svn-id: https://svn.apache.org/repos/asf/maven/sandbox/trunk@1639199 13f79535-47bb-0310-9956-ffa450edef68
more efficient maven-plugin-plugin configuration

git-svn-id: https://svn.apache.org/repos/asf/maven/sandbox/trunk@1639230 13f79535-47bb-0310-9956-ffa450edef68