Add ability to navigate without adding current scene to backstack

Since the items in the drawer should not add the previous scene to the backstack but stay the first scene I added the ability to navigate without adding the current scene to the backstack (previous scenes)

app/actions/navigation.js

import * as types from './actionTypes';
-export function navigate(scene) {
+export function navigate(scene, addToBackStack = true) {
return {
type: types.NAVIGATE,
scene,
+    addToBackStack,
};
}