added health check endpoint

services/spelling/app.coffee

@@ -7,6 +7,8 @@ Path = require("path")
 metrics = require("metrics-sharelatex")
 metrics.initialize("tpds")
 metrics.mongodb.monitor(Path.resolve(__dirname + "/node_modules/mongojs/node_modules/mongodb"), logger)
+HealthCheckController = require("./app/js/HealthCheckController")
+
 
 server = restify.createServer
 	name: "spelling-sharelatex",
@@ -20,6 +22,9 @@ server.post "/user/:user_id/learn", SpellingAPIController.learn
 server.get "/status", (req, res)->
 	res.send(status:'spelling api is up')
 
+server.get "/health_check", HealthCheckController.healthCheck
+
+
 host = Settings.internal?.spelling?.host || "localhost"
 port = Settings.internal?.spelling?.port || 3005
 server.listen port, host, (error) ->

services/spelling/config/settings.defaults.coffee

@@ -12,3 +12,5 @@ module.exports = Settings =
 	mongo:
 		url : 'mongodb://127.0.0.1/sharelatex'
 
+
+	healthCheckUserId: "53c64d2fd68c8d000010bb5f"

services/spelling/package.json

@@ -8,16 +8,17 @@
   },
   "version": "0.1.0",
   "dependencies": {
-    "express": "3.1.0",
     "async": "0.1.22",
-    "restify": "2.5.1",
-    "settings-sharelatex": "git+https://github.com/sharelatex/settings-sharelatex.git#v1.0.0",
+    "express": "3.1.0",
     "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",
-    "node-statsd": "0.0.3",
-    "underscore": "1.4.4",
     "mongojs": "0.9.11",
-    "redis": "~0.8.4"
+    "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"
   },
   "devDependencies": {
     "bunyan": "^1.0.0",