BREAKING: [CLI] New app template: Resize UI when keyboard is shown on Android

Summary:
When building the Chat example for react-navigation, I realized the default Android behavior doesn't actually work:

<img width="868" alt="screenshot 2017-02-01 15 15 25" src="https://cloud.githubusercontent.com/assets/346214/22512559/518e3bf0-e891-11e6-9a86-2dafac5b250f.png">

(From https://developer.android.com/guide/topics/manifest/activity-element.html)

In my app there's a `<ListView>` and a `<TextInput>` below it. Without this PR the UI pans which is a very bad user experience.

Keyboard is hidden:

<img width="437" alt="screenshot 2017-02-01 15 21 15" src="https://cloud.githubusercontent.com/assets/346214/22512814/23fc93d4-e892-11e6-9e45-94041dbe8eba.png">

Keyboard is shown:

<img width="439" alt="screenshot 2017-02-01 15 26 56" src="https://cloud.githubusercontent.com/assets/346214/22513062/e4e1835c-e892-11e6-93b7-fe5616135b91.png">

 ---

Let's use "adjustResize", it seems to be a reasonable default in most cases and people can always change the constant in their AndroidManifest.xml
Closes https://github.com/facebook/react-native/pull/12154

Differential Revision: D4496428

fbshipit-source-id: c300ebe55bd93f8b243e0d7d0d6a132bc3a5a1c1

local-cli/templates/HelloWorld/android/app/src/main/AndroidManifest.xml

@@ -19,7 +19,8 @@
       <activity
         android:name=".MainActivity"
         android:label="@string/app_name"
-        android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
+        android:configChanges="keyboard|keyboardHidden|orientation|screenSize"
+        android:windowSoftInputMode="adjustResize">
         <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />