add httpd plugin to embed nano web server into cordova app

Embed nano web server into Cordova App.

Supported platform:
＊ iOS
＊ Android

You can browse (locally or remotely) to access files in android/ios phone/pad:
＊ browse the files in mobile device with a browser in PC.
＊ copy files from mobile device to PC quickly, just with Wifi.
＊ use Cordova webview to access the assets/www/ content with http protocol.

Why http access is good?
＊ Use wifi instead of cable, more convenient.
＊ For security reason, browser does not support local AJAX calls. It's big bottle neck to deploy HTML5 games to Cordova platform.
＊ The most popular phaser.js game engine, a httpd is always required, as it use AJAX to load resource.

This plugin is being used by the famous Meteor project.