clean up Android Beam sample

Change-Id: Ieffe60c0a17509284a112eb11a7588e80e1578ee
diff --git a/samples/AndroidBeam/AndroidManifest.xml b/samples/AndroidBeam/AndroidManifest.xml
index 5fb9f55..e01eb2d 100644
--- a/samples/AndroidBeam/AndroidManifest.xml
+++ b/samples/AndroidBeam/AndroidManifest.xml
@@ -22,6 +22,8 @@
         android:versionCode="1"
         android:versionName="1.0">
     <uses-permission android:name="android.permission.NFC" />
+    <uses-sdk android:minSdkVersion="14" />
+    <uses-feature android:name="android.hardware.nfc" />
     <application android:icon="@drawable/icon" android:label="@string/app_name">
         <activity android:name="com.example.android.beam.Beam"
                 android:label="@string/app_name"