update readme pointing to github

git-svn-id: http://plugins.svn.wordpress.org/dko-openid-delegation@658250 b8457f37-d9ea-0310-8a92-e5e31aec5664
add options page in admin_menu hook

git-svn-id: http://plugins.svn.wordpress.org/dko-openid-delegation@666050 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merge branch 'master' of github.com:davidosomething/dko-openid-delegation