Renomve unused vars in app.js

Author: Rachel Macfarlane

app.js

@@ -39,14 +39,14 @@ app.use(function(req, res, next) {
 app.use('/', index);
 
 // catch 404 and forward to error handler
-app.use(function(req, res, next) {
+app.use(function(_req, _res, next) {
   var err = new Error('Not Found');
   err.status = 404;
   next(err);
 });
 
 // error handler
-app.use(function(err, req, res, next) {
+app.use(function(err, req, res, _next) {
   // set locals, only providing error in development
   res.locals.message = err.message;
   res.locals.error = req.app.get('env') === 'development' ? err : {};