Revision 293497

Resolving: MNG-1021

o Added AttachedArtifact, and changed the DefaultMavenProjectHelper to create and attach artifacts of this type. AttachedArtifact uses a parent artifact (constructor parameter) for versioning and basic identity attributes, but requires the user to specify a type and classifier specific to the new artifact. We may want to add flexibility for artifactId, too...though I have reservations on that score.

o See it0079 for a test.