Commandline argument namespacing (ala "cs.config" instead of "config") to avoid collisions

Depending on the app you're clustering, it may be desirable to avoid argument collisions with namespacing; especially with pre-existing apps that you wish to cluster. If any single option is detected with the prefix of `cs.` it will assume that all arguments are prefixed with this key, and any non-prefixed key will be ignored (assumed as app-specific). This allows both namespacing and backward compatibility.