Changes to Residualization

removed the request property factors/items/factorResidualization

removed the request property factors/items/factorReturns

added the new optional request property dependentFactorResidualizationMethod

added the new optional request property factors/items/dependentFactorReturns

added the new optional request property factors/items/explanatoryFactorReturns

added the new optional request property riskFreeReturn

added the new optional request property riskFreeReturns