Minor fix in config schema: namespaces and resources elements are optional.
Minor fix in config schema: namespaces and resources elements are optional.

SparkViewEngine/spark,RobertTheGrey/spark,SparkViewEngine/spark,RobertTheGrey/spark,SparkViewEngine/spark,RobertTheGrey/spark,RobertTheGrey/spark,SparkViewEngine/spark,SparkViewEngine/spark,SparkViewEngine/spark,SparkViewEngine/spark,RobertTheGrey/spark,RobertTheGrey/spark,RobertTheGrey/spark