Misc: Simplified the readyList execution code.

* event objects have isDefaultPrevented, isPropagationStopped and isImmediatePropagationStopped methods.
* Removed donative and dohandlers from $.trigger
* event.result carries the last returned data from a handler(not undefined).
* $.trigger doesn't keep bubbling if stopPropagation() is called.
* Same event object is used all along for global trigger
* Fixed the bug where target doesn't change when triggering on many elements.
* The data array on $.trigger was accumulating objects as it bubbles.
testrunner: adding more tests

Made sure that return false works in .live() along with the event object being passed in as the first argument.

jquery data: Closes #3539. Exposed jQuery.queue. Moved all the data and queue functions to their own module. Made the dequeue function more generic(designed to be used on functions). Closes #3748. Reverted a previous modification.

jquery event: Closes #3662. Adds a jQuery.Event class. Makes trigger and fix simpler. Adds currentTarget attribute to event objects. Event object isn't passed as part of data.

jquery core: Closes #1681. jQuery.fn.toggleClass can accept a boolean argument indicating add/remove.

jquery core: Closes #3255. The div used in jQuery.clean is emptied in the end. Cleaning the parentNode's properties of the elements.

Added a new liveQuery/event delegation hybrid method: .live and .die. Easily adapts event delegation to the jQuery style. $("div").live("click", fn); $("div > #foo").live("submit", fn); $("div").die("click");

Added the new jQuery.support object and removed all uses of jQuery.browser from within jQuery itself (while simultaneously deprecating the use of jQuery.browser).

Fixed an issue with domManip where the incorrect document was being used to create the document fragment.

Landing the new Sizzle selector engine. There'll need to be some later tweaks (to make the tests a little more pragmatic - especially for document order elements). But it appears to be passing well and that's enough. Closes #3563.

Rewrote the hide and show methods to fix the issue with Safari not hiding distached elements. Fixed #1239, #2233, #3038, #3343, #3395. They're also faster now, as well.