dbservestyl - Serve .styl files as .css

######Example:
``javascript
"use strict";

const dbservestyl = require('dbservestyl');
const express = require('express');
const path = require('path');

let app = new express();

app.use('/css', function(req, res, next) {
let index = path.join(__dirname, "/www/css");
let fn = dbservestyl(index);

fn(req, res, next);
});

app.use('/', function(req, res, next) {
let index = path.join(__dirname, "/www");
let fn = express.static(index);

fn(req, res, next);
});

app.listen(8080);
``