add script example for Cray jobs

Link: https://github.com/GeneAssembly/biosal/issues/607
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
use Cray aprun core specialization

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
rename directories for Cray and IBM

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>