fix(package): update mongodb to version 2.2.27

package.json

@@ -119,7 +119,7 @@
     "is-url": "1.2.2",
     "js-yaml": "3.8.4",
     "mime-types": "2.1.15",
-    "mongodb": "2.2.26",
+    "mongodb": "2.2.27",
     "monk": "5.0.1",
     "morgan": "1.8.1",
     "ms": "2.0.0",