New payload support, runtime warnings, and other misc fixes

* Added support for new os_data nested payload
* Fixed issue where OneSignal_APPID was not being read from the plist.
* Depercated setDefaultClient, set automaticly and should not be changed.
* Fixed iOS 9 warnings about cydia

Author: jkasten2

OneSignalExample/AppIcon.xcassets/AppIcon.appiconset/Contents.json

@@ -104,9 +104,9 @@
       "scale" : "2x"
     },
     {
-      "idiom" : "car",
-      "size" : "120x120",
-      "scale" : "1x"
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
     },
     {
       "size" : "24x24",
@@ -161,6 +161,11 @@
       "scale" : "2x",
       "role" : "quickLook",
       "subtype" : "42mm"
+    },
+    {
+      "idiom" : "car",
+      "size" : "120x120",
+      "scale" : "1x"
     }
   ],
   "info" : {