Implemented news and admin page design.

Implemented news and admin page design.
Updated README.md to mention TinyMCE, and corresponding license.
    README.md
    application/models/news_model.php
    application/views/header.php
    application/views/news_edit.php
    application/views/news_show.php
    application/views/pages/news.php
    css/base.css
    css/style.css
    license.txt