Added admin folder for controller-protection

Added admin folder for controller-protection
See admin/folder-info for more details.

    .htaccess
    admin/folder-info.txt   (+)
Implemented database managed blogging system.

Implemented database managed blogging system.

The implemented system allows management of a database table, `news`, with the
following schema:

CREATE TABLE `news` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `title-en` varchar(256) NOT NULL,
   `title-no` varchar(256) NOT NULL,
   `text-no` text NOT NULL,
   `text-en` text NOT NULL,
   `published` boolean NOT NULL,
   `date` date,
   PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

To list all entries, use url: /admin/show
To edit an entry, use url:    /admin/edit/[id]
To create a new entry, use:   /admin/edit/new
To delete an entry, use:      /admin/remove/[id]

Automatic redirection from admin/ to admin/show
    admin/index.php   (+)

Controller that handles the page administration:
    application/controllers/admin.php   (+)

Model that communicates with database.
    application/models/news_model.php   (+)

Views that allow edits or shows entries:
    application/views/news_edit.php   (+)
    application/views/news_show.php   (+)

Small change to form_helper to not use full url in form target.
    system/helpers/form_helper.php