Merge pull request #8 from sharelatex/sk-node-6

upgrade to node 6.9.5

services/spelling/.nvmrc

@@ -1 +1 @@
-0.12.4
+6.9.5

services/spelling/package.json

@@ -15,7 +15,7 @@
     "logger-sharelatex": "git+https://github.com/sharelatex/logger-sharelatex.git#v1.1.0",
     "lru-cache": "^4.0.0",
     "metrics-sharelatex": "git+https://github.com/sharelatex/metrics-sharelatex.git#v1.7.1",
-    "mongojs": "1.3.0",
+    "mongojs": "2.4.0",
     "node-statsd": "0.0.3",
     "redis": "~0.8.4",
     "request": "^2.53.0",