Remove json related modules

Add options to script module
Fix basic_stream_tests

- Replace json-field-value-extractor processor with splitter that uses
XD-1378: Add metadata to Splunk module
Fix tweet tests.

Use hyphenated module name 'aggregate-counter' and correct option.
XD-1435 Update Executions Page

- Added job name, instanceId along with the conditional check to show
restart action button only if the job execution is restartable.
- Fixed the JobExecution list to refresh the list upon restart action
XD-1436 Miscellaneous cleanup in UI

- Fix subtitle text on each tab in Jobs page that would vary based on
the tab selected.
- Fix job name display in Job launch page
- Style fix for batch job and subtitle so that avoids empty lines
occupying the prime view
XD-1418 XD-1419 XD-1420 - Add support for machine learning

These three issues are

 - XD-1418 - Create subproject spring-xd-analytics-ml.
 - XD-1419 - Create subproject spring-xd-analytics-ml-pmml.
 - XD-1420 - Create a JPMML module that will evaluate a model.

The project spring-xd-analytics-ml adds basic support for advanced analytics by providing the necessary infrastructure to be able to define analytic stream processors by introducing a new module

The project spring-xd-analytics-ml-pmml adds support for evaluation of PMML models from an analytic stream processor

The module XML defintion is located in modules/processor/analytic-pmml/

Additional Javadoc and reference documentation will come in a seperate commit