[maven-release-plugin] copy for tag apache-18

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/tags/apache-18@1743047 13f79535-47bb-0310-9956-ffa450edef68
tree: 9791fddfcbc9d5dbeec2b2d204dc8cf843713b2e
  1. pom.xml
  2. site-pom.xml
  3. src/