support sample size as command-line argument
support sample size as command-line argument

OpenBEL/openbel-api,OpenBEL/openbel-server,nbargnesi/openbel-server,OpenBEL/openbel-api,OpenBEL/openbel-server,nbargnesi/openbel-server,OpenBEL/openbel-server,OpenBEL/openbel-api,nbargnesi/openbel-server,OpenBEL/openbel-api