MIT license header is missing

I see that your intent is to license your code under the MIT license.  That license requires that a specific comment be placed at the top of each of your source files.  

The license text is found here:  (http://www.opensource.org/licenses/mit-license.php)

Please add the required comment to the msgpack source files, so that others can safely use your code under the MIT license, as you intended.
