PathContainerView extends Flow.Dispatcher.

And PathContainer doesn't need to keep its client view in a field.

```
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Flow (Parent) ...................................... SUCCESS [  0.455 s]
[INFO] Flow ............................................... SUCCESS [  3.813 s]
[INFO] Flow Sample ........................................ SUCCESS [  9.644 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 15.112 s
[INFO] Finished at: 2014-11-11T09:09:57-08:00
[INFO] Final Memory: 68M/720M
[INFO] ------------------------------------------------------------------------
```