XXX - PoC Support for Advanced analytics in Spring XD.

Another round of heavy refactoring...
XD-1420 - Create a jpmml module that will evaluate a model.

Added basic support for advanced analytics by providing the necessary infrastructure to be able to define analytic stream processors by introducing a the new module "spring-xd-analytics-ml".
Added support for evaluation of PMML models from an analytic stream processor by introducing the spring-xd-analytics-ml-pmml module.

See spring-xd-analytics-ml-pmml/README.MD and spring-xd/modules/processor/analytic-pmml/config/analytic-pmml.xml for further information.