[MRESOURCES-131] Maven resources plugin does not honour maven.test.skip flag
Add missing since tag.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1525441 13f79535-47bb-0310-9956-ffa450edef68
Add missing license headers.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1525443 13f79535-47bb-0310-9956-ffa450edef68