Fixed lint issues

Author: johnkil

multibackstack-sample/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <manifest
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="com.jetradar.multibackstack.sample">
 
   <application
@@ -8,7 +9,8 @@
       android:icon="@mipmap/ic_launcher"
       android:label="@string/app_name"
       android:supportsRtl="true"
-      android:theme="@style/Theme.MultiBackStack">
+      android:theme="@style/Theme.MultiBackStack"
+      tools:ignore="GoogleAppIndexingWarning">
 
     <activity android:name=".MainActivity">
       <intent-filter>

multibackstack-sample/src/main/res/layout/fragment_item.xml

@@ -14,4 +14,4 @@
       android:layout_height="match_parent"
       tools:text="Item"/>
 
-</FrameLayout>
+</FrameLayout>