o proxy parent POM if not found in the repo when building the effective POM when creating metadata (also applied the same in dependency tree builder)
o added unit tests
o moved out wagonfactory classes into separate module so it can be used by maven2-repository w/o depending on archiva-proxy module (as it inroduces cyclic dependency)
git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1135978 13f79535-47bb-0310-9956-ffa450edef68
