Merge pull request #6869 from simllll/patch-4

Upgrade driver: mongodb to 3.1.3 and mongodb-core to 3.1.2, fixes #6692 & #6670

Author: vkarpov15

package.json

@@ -23,8 +23,8 @@
     "bson": "~1.0.5",
     "kareem": "2.2.1",
     "lodash.get": "4.4.2",
-    "mongodb": "3.1.1",
-    "mongodb-core": "3.1.0",
+    "mongodb": "3.1.3",
+    "mongodb-core": "3.1.2",
     "mongoose-legacy-pluralize": "1.0.2",
     "mpath": "0.4.1",
     "mquery": "3.1.2",