Adjusted header in license file to be consistent with other content repos

Author: rdworth

MIT-LICENSE.txt renamed to LICENSE-MIT.txt

@@ -1,5 +1,8 @@
-Copyright 2013 jQuery Foundation and other contributors
-http://jquery.com/
+Copyright (c) 2013 jQuery Foundation, http://jquery.org/
+
+This software consists of voluntary contributions made by many
+individuals. For exact contribution history, see the revision history
+and logs, available at http://github.com/jquery/learn.jquery.com
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the