Adding direct link to setting from Plugin list + a new file to uninstall Plugin's options 

git-svn-id: https://plugins.svn.wordpress.org/olalaweb-mailchimp-campaign-manager/trunk@1023756 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add uninstall.php file

git-svn-id: https://plugins.svn.wordpress.org/olalaweb-mailchimp-campaign-manager/trunk@1023757 b8457f37-d9ea-0310-8a92-e5e31aec5664