Implement flexible generation of path #5
Description
Presently for CSS and JavaScript tags, path is generated like <script src='/assets/js/application.js'></script>. This path restrict browsers to fetch resources from root. Many a times during local development most developers don't create virtual-host and prefer to run web-apps under some directory in web-root which creates path like http://localhost/my_web_app. Inserting / before paths makes it difficult for those developers to use this library.
A clean way to achieve abstraction is to use CodeIgniter's built-in site_url method to generate path for assets. This will create correct path in every case.