Refined Javadoc
Relaxed the visibility of Computable implementations

All classes are annotated with @Beta, which means that they are subject
to incompatible changes, or even removal.
The preferred way of interfacing JPMML with application code is via
ResultFeature subinterfaces.
Added DefaultClassificationMap class

A ClassificationMap subclass may implement only one of HasProbability,
HasAffinity or HasConfidence interfaces.