Merge pull request TwilioDevEd#582 from TwilioDevEd/viktormuller-patch-2

Notify - Adds instance id service sample

Author: Kat King

notifications/register/instance-id-service/instance-id-service.java

@@ -0,0 +1,18 @@
+public class MyInstanceIDService extends FirebaseInstanceIdService {
+
+    private static final String TAG = "NotifyFbIIDService";
+
+    /**
+     * Called if InstanceID token is updated. This may occur if the security of
+     * the previous token had been compromised. Note that this is called when the InstanceID token
+     * is initially generated so this is where you would retrieve the token.
+     */
+    // [START refresh_token]
+    @Override
+    public void onTokenRefresh() {
+        Intent intent = new Intent(this, RegistrationIntentService.class);
+        startService(intent);
+    }
+    // [END refresh_token]
+
+}