run_server parses command line arguments.

It's convenient to have a sleep sometimes at startup before
setup_virtualenv, so the network environment can finish setting
up. This meant adding a second argument to run_server, so I added some
basic command line parsing in bash.

run_server now supports:
  --sleep n: Sleep for n seconds.
  --setup:   Run setup_virtualenv before running the service.
  -s:        Alias for --setup.
  python program arguments.