adding a couple of convenience methods to use TypeAndClassifier instance to create a related ArtifactRef.
turn off a bunch of sorting that isn't even used (results are returned in an unordered Set anyway).
Improve caching of project nodes for a view.
cache GraphWorkspace instances so we don't load multiple copies for a given id, and don't reject self-referential parent relationships.
[maven-release-plugin] prepare release atlas-parent-0.9.1
[maven-release-plugin] prepare for next development iteration