Fix example project

Fixes #338

example/android/app/src/main/AndroidManifest.xml

         android:name=".MyApplication"
         android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
-        android:label="@string/app_name">
+        android:label="@string/app_name"
+        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name">

example/android/build.gradle

         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.3'
+        classpath 'com.android.tools.build:gradle:2.2.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files