Replace strategies for Distributor and Merger with enums
Currently I have to configure a distributor stage as follows:
distributor.setStrategy(new CopyByReferenceStrategy<IFlowRecord>());
Additionally to issue #88 (closed) I would prefer to use the strategies as enums:
distributor.setStrategy(DistributorStrategy.COPY_BY_REFERENCE);
or
distributor.setStrategy(Distributor.COPY_BY_REFERENCE);