Added flot as submodule for graphin of sitemap counts.
Adding stylesheets and initial themeing for the admin page.

Added a plugin stylesheet in `css/style.css`.

Added the appropriate hooks to load the stylesheet and javascript libs on
the admin page.

Did some initial styling for the stats box.
Got sitemap stats graph working on admin page and added styles.

The sitemap stats graph on the admin page now fetches data via AJAX every
5 minutes. By default shows the last 10 days of indexed url counts.
Fixed bug where graph maximum may not always be current.
Removed unneeded sitemap status text.

Removed unneeded sitemap status text that was being displayed and moved
the create status down near the action buttons.
Adding capability check for sitemap stats AJAX callback.
Cleaning up script and style enqueues.

Replacing calls to wp_register_s*() with wp_enqueue_s*() to remove
redundant lines of code.
Using `wp_send_json()` instead of `die()` in AJAX calls.
Merge pull request #65 from Mobius5150/new_theme

New theme