Moved a bunch of methods out of the jQuery-specific Sizzle code into more-appropriate files, in jQuery itself.

Added the submodule init/update to the Makefile for 'make test' and updated the README to be more current.

Pull in QUnit using a submodule. In order to build jQuery (and run the tests) you'll need to do 'git submodule init' and 'git submodule update' after checkout.

Fixed the cleaning method to support namespaced elements. Thanks to einaros for the patch recommendation. Fixes #5358.

A follow-up to [6578] (which stopped adding expandos to elements that didn't have data). That broke jQuery.unique() (so we're now using the unique from Sizzle). Using Sizzle's unique (which also sorts in document order) changed how add, andSelf, parents, nextAll, prevAll, and siblings work. after and before were changed to not use .add() (in order to guarantee their position in the jQuery set). Also, jQuery.data(elem) was updated to return that element's data object (instead of its ID).

$("<div/>").after("<span/>")
=> [ div, span ]
(calling after on a disconnected DOM node adds the nodes to the end of the jQuery set)

$("<div/>").before("<span/>")
=> [ span, div ]
(calling before on a disconnected DOM node adds the nodes to the beginning of the jQuery set)

$("div").add("span")
=> [ div, span, span, div, span ]
(results now come out in document order)

$("div").find("code").andSelf();
=> [ div, code, code ]
(results now come out in document order)

Same goes for .parents(), .nextAll(), .prevAll(), and .siblings().

Exception: .parents() will still return the results in reverse document order.

jQuery.data(elem)
=> { object of data }
(no longer returns the unique ID assigned to the node)

jquery event: closes #5250. bind(), unbind() and one() support Object Literals (needs some refactor though)

fixed global variables introduced in for loop with missing var-keyword (detected via QUnit's no ?noglobals)

Adding some fixes for commit [6537]. If there's leading whitespace, or if an exception is thrown by innerHTML, we need to use the old style method.

Fix for SVN rev [6537]. Events weren't being unbound correctly in Internet Explorer (cleanData wasn't handling malformed NodeList results correctly).