fixed classpath routing for lenskit train test evaluations using disc cached recommender components see bug #518
Made changes in response to pull request.
Merge pull request #519 from kluver/feature/kluver-518-classloaderRouting

Fix class loader routing in the evaluator, closing #518.
Add saved-model support to graph CLI command
Add toString methods
Bump argparse4j version
Clean up and make resusable the logging configuration
Improve FunkSVD status logging
make addLoggingGroup public
Document and enforce that recommender engines have graphs
Clean up and document graph-loading logic
Improve documentation of logging configuration