use mongoClient on connection

manifest.yml

@@ -0,0 +1,5 @@
+applications:
+- name: cla-assistant-staging
+  services:
+  - cla-staging-env
+  - my-logs

package.json

@@ -38,7 +38,7 @@
     "karma-mocha": "^1.1.1",
     "memory-cache": "^0.1.6",
     "merge": "^1.2.0",
-    "mongoose": "^4.5.2",
+    "mongoose": "^4.11",
     "node-sass-middleware": "^0.10.0",
     "passport": "^0.3.2",
     "passport-accesstoken": "^0.1.0",
@@ -80,7 +80,7 @@
     "supertest": "2.0.1"
   },
   "engines": {
-    "node": "6.10.3"
+    "node": "7.10"
   },
   "scripts": {
     "start": "node app.js",

src/server/app.js

@@ -142,15 +142,13 @@ async.series([
         var mongoose = require('mongoose');
 
         mongoose.connect(config.server.mongodb.uri, {
-            server: {
+            useMongoClient: true,
-                socketOptions: {
+            keepAlive: true
-                    keepAlive: 1
+        }, (err, db) => {
-                }
+            bootstrap('documents', callback);
-            }
         });
 
         global.models = {};
-        bootstrap('documents', callback);
     },
 
     function (callback) {

src/server/documents/cla.js

@@ -11,7 +11,10 @@ var CLASchema = mongoose.Schema({
     ownerId: String,
     repo: String,
     repoId: String,
-    org_cla: { type: Boolean, default: false },
+    org_cla: {
+        type: Boolean,
+        default: false
+    },
     user: String,
     userId: String,
 });