Landing Ben Alman's patch to add nextUntil, prevUntil, and parentsUntil. Also adds some tests for prevAll and nextAll, and fixes an test edge case in parents.

Adding in support for bubbling submit and change events, thanks to the patch by Justin Meyer. Includes a delegation test suite for manually testing to see if the events work as intended.

Re-arranged many of the selector tests, breaking them into smaller test groups and into more-appropriate sections.

Landed the rest of the liveHandler rewrite that takes advantage of the new closest multi-selector signature (sorry, accidentally committed some of it in the wrong commit: 4daae7a7).

Extracted the logic for copying events from one jQuery set to another, makes it easier to work with disconnected DOM nodes.

Make sure that a DOM node isn't getting passed through (as is the case in IE, it has a toString of [object Object].

Switched from using Git Submodules to just doing a straight clone of the QUnit and Sizzle directories. Works much better for what we want.