Removed favicon middleware

For reference: https://github.com/visionmedia/express/issues/1979

app.js

@@ -58,7 +58,6 @@ app.use(connectAssets({
   helperContext: app.locals
 }));
 app.use(express.compress());
-app.use(express.favicon());
 app.use(express.logger('dev'));
 app.use(express.cookieParser());
 app.use(express.json());