classList not supported in ie9 and below

[GordanBlake]

on line 60 in main.js you could use: document.body.className += 'initialized';

instead of: document.body.classList.add('initialized');

that will work on every other browser too.

It still won't make the app work on ie9 but it is a step forward.

Same must be done to the other classList calls on read-along.js.

PS: .dataset is unsupported too