Bug Fixed: Redirect `home` to `/` && Open home page automatically in development mode

1. Since express has   Removed `res.redirect('home')` support  after the
version `3.0.0alpha1 / 2012-04-15`, It may lead a 404 error in some
error handling situation.

2. Open home page automatically in Windows, Linux && Mac platform when using `node app.js` to start the we server
`osPlatform`不好，`platform`吧