S4 command line utility

I'd like to propose that we provide a command line utility similar to play in Play! Framework. The idea is to implement various common function using a single utility program. Examples:

> s4 build // builds an app
> s4 load // loads an app to the cluster.
> s4 unload // stops and unloads an app from the cluster
> s4 stats // provide stats about a running cluster

We can start by modifying the Play script which is under Apache license.