Added options page

git-svn-id: https://plugins.svn.wordpress.org/full-screen-background-images/trunk@984282 b8457f37-d9ea-0310-8a92-e5e31aec5664
Readme update

git-svn-id: https://plugins.svn.wordpress.org/full-screen-background-images/trunk@984283 b8457f37-d9ea-0310-8a92-e5e31aec5664