Simplify readme
Streams get passed an "item" which has req/res and helper functions
Modules can send a "terminate" event upstream to shutdown the pipeline
Extract common base stream : FLStream
Fix ConsoleSummary "end" event
Remove duplicated code in StopCount (now in FLStream)
ConsoleSummary waits for all responses to print the report
Emit shutdown message
ConsoleSummary: min max and average response times
README: sample output
ConsoleSummary: better stats and percentiles