cosmetics
Modernizr is licensed under MIT license
update jQuery to v1.8.3
.gitignore: sort entries by name
update jquery.mousewheel to v3.1.3
update spin.js to v1.3.0
update html5 boilerplate to 4.2.0
update json2 to the latest git (2013-05-26)
Update markdown-js to 9c21acdf08fb20a7ec1faa842a5092ec7dedaf8c.
update Underscore.js to v1.5.0