3.0.0-rc5

• Added binnedSplit(), binnedFold(), and stratifyByLabelBins()
• stratifiedSplit() and stratifiedFold() now throw on continuous labels
• Validators and regressors now stratify continuous labels by bin
• Image Rotator offset is now optional and default jitter is 0.2
• Added fillColor parameter to Image Rotator
• Remove holdOut paramereter from Learners with validation set
• Added setValidationDataset() method to Learners with validation set
• Pipeline is now a Transformer decorator
• Added PersistentTransformer decorator