YUI Event Utility
    DOM event utilities

3.1.1
    - No changes 
	
3.1.0
    - Removed deprecated 'delegate' custom event.  As of 3.1 use the delegate method on a Node instance or Y instance.
    - Updated the event-focus submodule so that the specialized focus and blur events that enable the focus and blur events to bubble do not apply when adding focus and blur events to the window object.
    - Synthetic event creation API added.
    - delegate enhancements.
    - unload event fix.
    - Compatibility with FireFox's untouchable anonymous div.

3.0.0
    - Added onreadystatechange fork in domready to handle the event in IE when YUI is hosted in an iframe.
    - Added mousewheel support.
    - Added Y.delegate function that is a bit easier to use than Y.on('delegate'...
    - Default scope of mouseenter and mouseleave events is the Node instance to which the listener is attached
    - Default scope of delegated event listeners is the Node instance that matched the supplied CSS selector
    - All special DOM event handlers (focus/blur/mousewheel,resize,delegate,etc) are
      broken down into submodules.  Core DOM event functionality is provided in event-base.js,
      and all of the functionality is rolled into event.js.
    - Additional Safari key remapping.
    - Special DOM events can now be routed through delegate.
    - Y.on can target Node and NodeList references correctly.
    - Fixed onAvailable lazy DOM listener detach handles.
    - When configured to return a detach handle, a single object is always returned.
      Previously requests that resolved to multiple listeners returned an array.

3.0.0beta1
    - DOM event, custom event, and simulate event moved to separate modules.
    - Added an event for DOM event delegation.  It only fires if the target or its descendants
      match a supplied selector.
        Y.on('delegate', fn, el, 'click', 'selector' ...
      The event facade sets the following properties:
        target: the target of the event
        currentTarget: the element that the selector matched
        container: the bound element (the delegation container)
    - Added mouseenter/mouseleave events
        Y.on('mouseenter', fn, el, 'click', 'selector' ...
        Y.on('mouseleave', fn, el, 'click', 'selector' ...
    - Added Y.on('windowresize', fn), which attempts to normalize
      when the event fires across all browsers (once at the end
      of the resize rather than continuously during the resize).
    - Fixed unsubscribeAll return value.
    - Added ability to skip facade creation where performance is a concern.
    - Moved DOMReady core to yui-base.
    - Focus/blur abstraction works in Opera when the bound element is the target
    - purgeElement only reads element guids, it does not create new ones for elements without one.
    - Event.attach returns a single handle if the result from collection processing is a single item.

3.0.0pr2
    - Fixed IE notification error when no arguments are supplied.
    - Added event-simulate.
    - getListeners works when the element has no listeners defined.
    - Event.addListener removed.  Exists only in compat layer.
    - addListerer triggers 2.x event behavior.
    - Removed extra undefined parameter passed to DOM event listeners.
    - Compat layer contains Event.on.
    - Event adapter support added to Y.on
    - Added Y.on('focus', 'blur' event adaptors (support for propagation
      of these events.)
    - publish and subscribe support an object for the type, allowing for multiple
      events/subscriptions.
    - subscriber failures throw an error by default rather than log.
    - subscriber failures are not routed through Y.fail in order to
      improve the debug experience.
    - New facades created every fire()
    - before method re-added to EventTarget, which delegates to Do.before or
      subscribe.
    - EventTarget.after will delegate to Do.after if type is a function
    - Added keylistener: Y.on('key', fn, element, 'down:13,65+ctrl+shift')
    - event:ready event deprecated in favor of domready.

3.0.0pr1
    - Initial Release
