CpkCoreService - Updated getElementsList method to allow override by a system kettle and added parameterProviders to the parameters.

CpkCoreServiceTest - Updated the line that called the getElementsList method (now has to pass a map of parameters)

CpkContentGenerator - Changed the declaration of the method "getElementsList" to "elementsList" to comply with the name of the system transformation/job

CpkContentGeneratorTest - Updated the line where getElementsList is called to "elementsList"