README
twixt-class Function
var clas = require("twixt-class"),
doc = require("twixt-document");
doc(function(document) {
var elem = document.getElementById("foo");
hidden = clas(elem, "hidden");
hidden(true); // add hidden class on "foo" element
hidden(false); // remove hidden class on "foo" element
hidden(); // return true/false from hidden class on "foo" element
});