extended graph wrapper API with content easily taken from tree API

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1351166 13f79535-47bb-0310-9956-ffa450edef68
10 files changed
tree: 8ed96285fa0c014f3aff3462b79f3824a9cbedfb
  1. src/
  2. pom.xml