#67 Fade "commit node" on amend

I know the description says "hide" but hiding wasn't too informative and feels like fade conveys notion of which commit node is being worked on.

I know that you did massive decoupling of the each components but I feel like staging having graphViewModel makes sense.  But if you feel like this is too tight, please let me know and I can change to staging only know about graph's head, not entire graph.


Cheers,

P.S. digging the modularized components!