Add a way to fire native events using dispatchEvent/fireEvent in testinit.js; fixes failing click test in FF3.6

More Details:
 - https://github.com/jquery/jquery/pull/562
 - http://bugs.jquery.com/ticket/9233

Now with working unit test for extra correctness! If external code defines a special.hover event, we won't string-hack "hover" into "mouseenter mouseleave".

Cleanup spacing. Fixes #10601

Core styleguide cleanup. Fixes #10586

If you are using `.data("events")` we would like to know how we can provide a documented interface that satisfies the need.

Between new 1.7 special event hooks and jQuery.event.simulate() we have a much cleaner solution than the people calling jQuery.event.handle are doing, but we shouldn't break their use of this undocumented internal interface for now.

Thanks davidmurdoch for staying with this bug!

As @timmywil points out, attributes and properties are confused by IE6/7. This commit also reworks the unit test case to do a better job of checking className matches.

Now, event.delegateTarget is always the element where the event was handled, regardless of whether delegated handlers are attached.

Logic to handle detaching by event was in both .off() and jQuery.event.remove; now it's only in .off(). It's a bit of a strange case since the event object (not the jQuery set) specifies the element.

This lets us use currentTarget for its intended use and avoids creating a non-standard delegateTarget property.

Clean up spacing in manipulation

More Details:
- https://github.com/jquery/jquery/pull/550
- http://bugs.jquery.com/ticket/10501