Added SGE runner.  Need to make runner selectable from command line.
Added SGE runner.  Need to make runner selectable from command line.
openwdl/wdl,broadinstitute/wdl,broadinstitute/wdl,openwdl/wdl,broadinstitute/wdl,openwdl/wdl,openwdl/wdl,broadinstitute/wdl