Feature/seqware 1949 metadata in memory

Allows whitestar to run without persistent metadata
Command invocation is: 

    seqware bundle launch --dir target/Workflow_Bundle_HelloOutOfOrder_1.0-SNAPSHOT_SeqWare_1.1.0-alpha.2-SNAPSHOT/ --engine whitestar --no-metadata
    seqware bundle launch --dir target/Workflow_Bundle_HelloOutOfOrder_1.0-SNAPSHOT_SeqWare_1.1.0-alpha.2-SNAPSHOT/ --engine whitestar-sge --no-metadata 

with the following line in the .seqware/settings

    SW_METADATA_METHOD=inmemory