Updated Readme.txt per Compassion's instructions.

git-svn-id: https://plugins.svn.wordpress.org/404gottenorg-404-page/trunk@803311 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed typo in Readme.txt

git-svn-id: https://plugins.svn.wordpress.org/404gottenorg-404-page/trunk@803317 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated referrer code on links to iFrame

git-svn-id: https://plugins.svn.wordpress.org/404gottenorg-404-page/trunk@803872 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated ref query string to referer

git-svn-id: https://plugins.svn.wordpress.org/404gottenorg-404-page/trunk@804050 b8457f37-d9ea-0310-8a92-e5e31aec5664