* Move findNodeHandle into the renderers and use instantiation
This is just like ReactDOM does it. This also lets us get rid of injection
for findNodeHandle. Instead I move NativeMethodsMixin and ReactNativeComponent
to use instantiation.
* Refactor findHostInstance
The reconciler shouldn't expose the Fiber data structure. We should pass
the component instance to the reconciler, since the reconciler is the
thing that is supposed to be instancemap aware.
* Fix devtools injection