Add more options for the Mongoose web-server in settings.json

```
Mongoose options:
https://github.com/valenok/mongoose/wiki/Manual

We might consider adding these to settings.json:

  access_log_file
  enable_directory_listing
  error_log_file
  extra_mime_types
  num_threads
  url_rewrite_patterns
```

Original issue reported on code.google.com by `czarek.t...@gmail.com` on 19 Jan 2013 at 4:03
