cosmetics
Modernizr is licensed under MIT license
update jQuery to v1.8.3
update underscore.js to v1.4.4
.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 83e1fb7bb4bb658ef1dbf59440293b8dff9acad7