convert app to use express not restifiy so it works with metrics-sharelatex

services/spelling/app.coffee

@@ -2,19 +2,18 @@ Settings = require 'settings-sharelatex'
 logger = require 'logger-sharelatex'
 logger.initialize("spelling-sharelatex")
 SpellingAPIController = require './app/js/SpellingAPIController'
-restify = require 'restify'
+express = require('express')
 Path = require("path")
+server = express()
+bodyParser = require('body-parser')
 metrics = require("metrics-sharelatex")
 metrics.initialize("spelling")
 metrics.mongodb.monitor(Path.resolve(__dirname + "/node_modules/mongojs/node_modules/mongodb"), logger)
 HealthCheckController = require("./app/js/HealthCheckController")
 
 
-server = restify.createServer
-	name: "spelling-sharelatex",
-	version: "0.0.1"
 
-server.use restify.bodyParser(mapParams: false)
+server.use bodyParser.json()
 server.use metrics.http.monitor(logger)
 
 server.post "/user/:user_id/check", SpellingAPIController.check

services/spelling/app/coffee/Metrics.coffee

@@ -1,23 +0,0 @@
-StatsD = require('node-statsd').StatsD
-statsd = new StatsD('localhost',8125)
-
-buildKey = (key)-> "spelling.#{process.env.NODE_ENV}.#{key}"
-
-module.exports =
-	inc : (key, sampleRate)->
-		statsd.increment buildKey(key, sampleRate)
-
-	Timer : class
-		constructor :(key)->
-			this.start = new Date()
-			this.key = buildKey(key)
-		done:->
-			timeSpan = new Date - this.start
-			statsd.timing("#{this.key}-time", timeSpan)
-			statsd.increment "#{this.key}-count"
-
-	gauge : (key, value, sampleRate)->
-		stats = {};
-		stat = buildKey(key)
-		stats[stat] = value+"|g";
-		statsd.send(stats, sampleRate);

services/spelling/app/coffee/SpellingAPIController.coffee

@@ -1,7 +1,7 @@
 SpellingAPIManager = require './SpellingAPIManager'
 restify = require 'restify'
 logger = require 'logger-sharelatex'
-metrics = require('./Metrics')
+metrics = require('metrics-sharelatex')
 
 module.exports = SpellingAPIController =
 	check: (req, res, next) ->

services/spelling/package.json

@@ -9,14 +9,14 @@
   "version": "0.1.3",
   "dependencies": {
     "async": "0.1.22",
-    "express": "3.1.0",
+    "body-parser": "^1.12.0",
+    "express": "^4.12.1",
     "logger-sharelatex": "git+https://github.com/sharelatex/logger-sharelatex.git#v1.0.0",
     "metrics-sharelatex": "git+https://github.com/sharelatex/metrics-sharelatex.git#v1.0.0",
     "mongojs": "0.9.11",
     "node-statsd": "0.0.3",
     "redis": "~0.8.4",
     "request": "^2.53.0",
-    "restify": "2.5.1",
     "settings-sharelatex": "git+https://github.com/sharelatex/settings-sharelatex.git#v1.0.0",
     "underscore": "1.4.4",
     "v8-profiler": "^5.2.4"