Add more options

[imjuniper]

Non-exhaustive list of options to add (mostly from serve-static)

• [x] dotfiles
• [ ] acceptRanges
• [ ] lastModified

Options that are not considered or a not priority:

• cacheControl, immutable, maxAge: You can set those easily with a header.
• extensions: Not considered, I'm not doing pretty URLs, only static files.
• fallthrough: Not really possible with the way things are currently, except for maybe with Bao.js.

[imjuniper]

dotfiles has been added in version 0.2.0