Made the extension setting class to accept the script path so that it inserts the Setting link to the plugin listing table if it is a plugin.

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@877023 b8457f37-d9ea-0310-8a92-e5e31aec5664
Assigned the default page slug to the template setting class. 

git-svn-id: https://plugins.svn.wordpress.org/fetch-tweets/trunk@877024 b8457f37-d9ea-0310-8a92-e5e31aec5664