eventing: no unbind in core

[brianleroux]

• this is fail

[remy]

Should the event model from "more" come in to base to enable the unbinding and give us a complete event model at the same time?

Or do we add a simple method as so:

xui.fn.un = function (type, fn) {
  return this.each(function () {
    this.removeEventListener(type, fn, false);
  });
};

[brianleroux]

I'm thinking un belongs in core... its an important feature. moving in closing. more should probably have more helpers for things like: swipe, pinch, etc