message: Navigated to next scene
  Added background colour to prevent previous scenes showing through
diff: import React from 'react';
  -import {StyleSheet, Text, View} from 'react-native';
  +import {StyleSheet, Text, View, TouchableHighlight} from 'react-native';
  -export default ({name}) => (
  +export default ({name, stateNavigator}) => {
  + const {url} = stateNavigator.stateContext;
  + return (
  <View style={styles.scene}>
  + <TouchableHighlight
  + underlayColor="white"
  + onPress={() => {
  + if (url === stateNavigator.stateContext.url)
  + stateNavigator.navigate('sceneTwo');
  + }}>
  <Text>{name}</Text>
  + </TouchableHighlight>
  </View>
  -);
  + )
  +};
  const styles = StyleSheet.create({
  scene: {
  flex: 1,
  justifyContent: 'center',
  alignItems: 'center',
  + backgroundColor: '#fff',
  },
  });
  