Rename fletch -> dartino

samples/github/android/GithubSample/app/src/main/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.google.fletch.githubsample" >
+    package="com.google.dartino.githubsample" >
     <uses-permission android:name="android.permission.INTERNET" />
 
     <application
         android:name=".MainApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity
                 android:parentActivityName=".MainActivity"
                 android:name=".LoginActivity">
         </activity>
     </application>
 
 </manifest>