cosmetics
Update README.md.

* specify the code language used
* Github uses https
* Modernizr is licensed under MIT license
Update package.json.

* add bugs property
* specify minimum node.js version
Update HTML5 Boilerplate to v4.3.0.
Update moment.js to v2.2.1.
Add a new line after banner text.
Update markdown-js to v0.6.0-beta1.