Unified Plugin parameter format
Visitor design pattern. Closes #4
Visitor actions
Visitor for nullifying SAX Locator information
Visitor for transforming SAX Locator information to serializable form
Fixed the serialization of FieldName instances

All class model classes must be serializable/deserializable using Java
serialization mechanism. This behaviour is guaranteed for complex types
(ie. inherited from PMMLObject class), but has to be implemented
manually for simple types.
[maven-release-plugin] prepare release 1.0.15
[maven-release-plugin] prepare for next development iteration
Updated version information