remove jquery

[jimmywarting]

Are you serious using jQuery for one simple thing? managing classes...

It can easily be replaced with this:

element.classList.contains("mdl-js-ripple-effect");
....
element.classList.add(html.join(' '))

its not only faster, but it also don't need to load a hole library that people don't use

[eric-swann-q2]

I've added a pull request for this #12