Keep header comment on minify

Some minifier keep header comment over its format.

1. YUI Compressor
It keeps the header comments beggining with `/*!`
  * http://yui.github.io/yuicompressor/css.html#special-comments

2. Closure compiler
It keeps the header comments containing `@license` or `@preserve`
  * https://developers.google.com/closure/compiler/docs/js-for-compiler#tag-license

I think header comment is very important because it includes its own license.

Author: tricknotes

github.js

@@ -1,8 +1,14 @@
-// Github.js 0.9.0
-// (c) 2013 Michael Aufreiter, Development Seed
-// Github.js is freely distributable under the MIT license.
-// For all details and documentation:
-// http://substance.io/michael/github
+/*!
+ * @overview  Github.js 0.9.0
+ *
+ * @copyright (c) 2013 Michael Aufreiter, Development Seed
+ *            Github.js is freely distributable.
+ *
+ * @license   Licensed under MIT license
+ *
+ *            For all details and documentation:
+ *            http://substance.io/michael/github
+ */
 
 (function() {