refactor(react-native-github): remove AsyncStorage from JS

Summary:
## Changelog
[JS][Removed] - Removed AsyncStorage module from react-native

Reviewed By: NickGerleman

Differential Revision: D40302352

fbshipit-source-id: 9377ea12036e498dde0b4b0f56de5c4fb9bd2461

Author: hoxyq

IntegrationTests/AsyncStorageTest.js

@@ -20,7 +20,6 @@ const {AppRegistry, ScrollView, StyleSheet, Text, TouchableOpacity, View} =
 const TESTS = [
   require('./IntegrationTestHarnessTest'),
   require('./TimersTest'),
-  require('./AsyncStorageTest'),
   require('./LayoutEventsTest'),
   require('./AppEventsTest'),
   require('./SimpleSnapshotTest'),