Reliable sleep times for Travis CI and readme badges

Author: jkasten2

OneSignalSDK/app/src/test/java/com/test/onesignal/MainOneSignalClassRunner.java

@@ -111,7 +111,7 @@ public void tagsAvailable(JSONObject tags) {
    public static void setUpClass() throws Exception {
       ShadowLog.stream = System.out;
 
-      testSleepTime = System.getenv("TRAVIS") == "true" ? 600 : 25;
+      testSleepTime = System.getenv("TRAVIS") != null ? 300 : 20;
 
       OneSignal_CurrentSubscription = OneSignal.class.getDeclaredField("subscribableStatus");
       OneSignal_CurrentSubscription.setAccessible(true);

README.md

@@ -1,9 +1,12 @@
 OneSignal Android Push Notification Plugin
 ====================================
 
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.onesignal/OneSignal/badge.png)](https://maven-badges.herokuapp.com/maven-central/com.onesignal/OneSignal)
+[![Build Status](https://travis-ci.org/one-signal/OneSignal-Android-SDK.svg?branch=master)](https://travis-ci.org/one-signal/OneSignal-Android-SDK)
+
 OneSignal is a free push notification service for mobile apps. This plugin makes it easy to integrate your native Android or Amazon app with OneSignal.
 
 - See http://documentation.onesignal.com/v2.0/docs/using-onesignal-in-your-android-app for Android setup documentation.
 - See http://documentation.onesignal.com/v2.0/docs/amazon-native-sdk-installation for Amazon setup documentation.
 
-- See http://documentation.onesignal.com/v2.0/docs/android-sdk-api for OneSignal API documentation.
+- See http://documentation.onesignal.com/v2.0/docs/android-sdk-api for OneSignal API documentation.