Adds liniting into the workflow (#3082)

* initial linting of src

* fix indent to 2 spaces

* Removes unnecessary rules

* ignore spec folder for now

* Spec linting

* Fix spec indent

* nits

* nits

* no no-empty rule

src/middlewares.js

@@ -142,21 +142,21 @@ export function handleParseHeaders(req, res, next) {
     return;
   }
 
-  return Promise.resolve().then(() => {
+  return Promise.resolve().then(() => {
     // handle the upgradeToRevocableSession path on it's own
     if (info.sessionToken && 
         req.url === '/upgradeToRevocableSession' && 
         info.sessionToken.indexOf('r:') != 0) {
-        return auth.getAuthForLegacySessionToken({ config: req.config, installationId: info.installationId, sessionToken: info.sessionToken })
+      return auth.getAuthForLegacySessionToken({ config: req.config, installationId: info.installationId, sessionToken: info.sessionToken })
     } else {
-        return auth.getAuthForSessionToken({ config: req.config, installationId: info.installationId, sessionToken: info.sessionToken })
+      return auth.getAuthForSessionToken({ config: req.config, installationId: info.installationId, sessionToken: info.sessionToken })
     }
   }).then((auth) => {
-      if (auth) {
-        req.auth = auth;
-        next();
-      }
-    })
+    if (auth) {
+      req.auth = auth;
+      next();
+    }
+  })
     .catch((error) => {
       if(error instanceof Parse.Error) {
         next(error);
@@ -221,7 +221,7 @@ export function allowCrossDomain(req, res, next) {
   else {
     next();
   }
-};
+}
 
 export function allowMethodOverride(req, res, next) {
   if (req.method === 'POST' && req.body._method) {
@@ -230,7 +230,7 @@ export function allowMethodOverride(req, res, next) {
     delete req.body._method;
   }
   next();
-};
+}
 
 export function handleParseErrors(err, req, res, next) {
   // TODO: Add logging as those errors won't make it to the PromiseRouter
@@ -258,10 +258,10 @@ export function handleParseErrors(err, req, res, next) {
     log.error('Uncaught internal server error.', err, err.stack);
     res.status(500);
     res.json({code: Parse.Error.INTERNAL_SERVER_ERROR,
-              message: 'Internal server error.'});
+      message: 'Internal server error.'});
   }
   next(err);
-};
+}
 
 export function enforceMasterKeyAccess(req, res, next) {
   if (!req.auth.isMaster) {