Can't save

Hi! Thanks for the nice job.

I've got an issue – I can't save:

```
saving:http://localhost:3000/index.html
/Users/xxx/yyy@zzz/initializr-bootstrap/server.js:147
            if (err) throw err;
                     ^

Error: ENOENT: no such file or directory, open 'http://localhost:3000/index.html'
    at Error (native)
```
