Removed plugin uri

git-svn-id: http://plugins.svn.wordpress.org/simple-general-settings/trunk@866907 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removed plugin uri

git-svn-id: http://plugins.svn.wordpress.org/simple-general-settings/trunk@866908 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix version number
Fix version number 0.5.1