message: Added navigation back for android
diff: import React from 'react';
  import {StyleSheet, ScrollView, Text, View, TouchableHighlight} from 'react-native';
  -import {spring} from 'navigation-react-native';
  +import {NavigationBackAndroid, spring} from 'navigation-react-native';
  export default ({color, moveScene, stateNavigator}) => {
  const {url} = stateNavigator.stateContext;
  return (
  <View style={styles.detail}>
  + <NavigationBackAndroid stateNavigator={stateNavigator} />
  <TouchableHighlight
  underlayColor="#fff"
  onPress={() => {
  