Updated the file reader dummy source to support the use of a transformation function.
Updated the file reader dummy source to support the use of a transformation function.

ITatJCU/iot-dataflow-graph-server,adamrehn/iot-dataflow-graph-server,adamrehn/iot-dataflow-graph-server,ITatJCU/iot-dataflow-graph-server,ITatJCU/iot-dataflow-graph-server,adamrehn/iot-dataflow-graph-server