Recipe: Compose tasks from the command line

I came up with this recipe when I wanted to test out different stream topologies from the command line. Adding it as a *recipe* in case others find it useful...

**Summary:**  
> By exposing the functionality of `run-sequence` on the command line,
> you can compose tasks into arbitrary flow on an _ad hoc_ basis.
> This enables testing alternate flows which can quickly be captured
> in tasks if they prove useful.