Continued working with plugins

- Learned how to add widgets to the admin dashboard via the
wp_add_dashboard_widget function and the wp_dashboard_setup hook.
- Leaned how to add DB options to other areas of the WP admin using the
add_settings_field function
- Finally learned how to update things in admin using the built in AJAX
feature. Here you can use ajax to do things making the user experience
better.  Using jQuery $.ajax, you can post to a query string that is
actually a function. this is done in the data option of the ajax call
Revert "Continued working with plugins"

This reverts commit 7c205b91027ce40f5dab33a4a86bdab0222ffc32.
Revert "Revert "Continued working with plugins""

This reverts commit 9ac45945992a601b0731db55cd462a5fa2755ea8.