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

[asilvas]

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.