Update Cloud Functions init

Author: samtstern

firestore/main/index.js

@@ -28,9 +28,8 @@ function initializeApp() {
 function initializeAppFunctions() {
   process.env.GCLOUD_PROJECT = 'firestorebeta1test2';
   // [START initialize_app_functions]
-  const functions = require('firebase-functions');
-
-  admin.initializeApp(functions.config().firebase);
+  const admin = require('firebase-admin');  
+  admin.initializeApp();
 
   let db = admin.firestore();