Update eslint, fix lint issues

server/boot/home.js

@@ -14,9 +14,9 @@ module.exports = function(app) {
       return next();
     }
     req.user.picture = defaultProfileImage;
-    req.user.save(function(err) {
+    return req.user.save(function(err) {
       if (err) { return next(err); }
-      next();
+      return next();
     });
   }
 
@@ -24,6 +24,6 @@ module.exports = function(app) {
     if (req.user) {
       return res.redirect('/challenges/current-challenge');
     }
-    res.render('home', { title: message });
+    return res.render('home', { title: message });
   }
 };