Added new analytics properties for push authentication tracking.

Author: roundhill

WordPressAnalytics/src/main/java/org/wordpress/android/analytics/AnalyticsTracker.java

@@ -89,7 +89,11 @@ public enum Stat {
         PUSH_NOTIFICATION_RECEIVED,
         SUPPORT_OPENED_HELPSHIFT_SCREEN,
         LOGIN_FAILED,
-        LOGIN_FAILED_TO_GUESS_XMLRPC
+        LOGIN_FAILED_TO_GUESS_XMLRPC,
+        PUSH_AUTHENTICATION_APPROVED,
+        PUSH_AUTHENTICATION_EXPIRED,
+        PUSH_AUTHENTICATION_FAILED,
+        PUSH_AUTHENTICATION_IGNORED
     }
 
     public interface Tracker {