Fix dependency issue

* Fix Process() object calling
* Add PokeParent() to poke upwards
* Break linear exec chains :(

This was the issue where in a graph f1 -> f2, if you were to rm f2 &&
cat f2, then f2 would not come back because we didn't poke upwards to
refresh the timestamp. Unfortunately this adds another bug which we
solve in a later patch.

service.go

@@ -182,7 +182,7 @@ func (obj *ServiceType) Watch() {
 
 		if send {
 			send = false
-			obj.Process(obj) // XXX: rename this function
+			Process(obj) // XXX: rename this function
 		}
 
 	}