Upgrade APNS to use HTTP/2

- uses universal certificate
- removes tests logs
- standardized returned promises from APNS and GCM to something usable in _PushStatus

package.json

@@ -18,7 +18,6 @@
   ],
   "license": "BSD-3-Clause",
   "dependencies": {
-    "apn": "^1.7.5",
     "aws-sdk": "~2.2.33",
     "babel-polyfill": "^6.5.0",
     "babel-runtime": "^6.5.0",
@@ -29,6 +28,7 @@
     "deepcopy": "^0.6.1",
     "express": "^4.13.4",
     "gcloud": "^0.28.0",
+    "http2": "^3.3.2",
     "mailgun-js": "^0.7.7",
     "mime": "^1.3.4",
     "mongodb": "~2.1.0",