Automated nested CV & result plotting (beta)

Major upgrade to netDx functionality but in beta stage. Wait for the next release to get a stable version.

• New functions to plot predictor results, including performance views (ROC/PR curves), Cyrest-based generation of EnrichmentMaps of selected features, and integrated PSN view.
  • Includes plotAllResults() which will do all this in a single function call.
• New R function to run nested cross-validation in single function call. Takes generic function for custom feature design as input.
• Three R notebooks illustrating predictor plotting and automated nested cross-validation. See .Rmd files in examples/ directory.