Added an Optional Settings fieldset to the widget and styled it with an admin stylesheet.

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@1019604 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added support for widget titles.

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@1019605 b8457f37-d9ea-0310-8a92-e5e31aec5664