{@link http://github.com/snbartell/node-spawn}
Convenience function. Overrides options.restarts to -1. Runs command indefinitely no matter the options passed into the constructor.
Shut down the child and don't let it restart.
Convenience function. Overrides options. restarts to 0. Runs command exactly once no matter the options passed into the constructor.
Start the cmd with the options provided.