This commit add $.create(), which allows you to create a
jQuery object that just has a name to identify it, as opposed
to some selector or HTML fragment. It's useful for things that
are really used as stubs.
This also fixes a bunch of the existing tests to use $.create().
Before this fix, you could actually just do $('some-stub'), but
now we enforce that the input to $() looks like a valid selector
or HTML fragment, and we make some exceptions for things like
window-stub and document-stub.
Hopefully this will make it more explicit that zjquery does
not truly simulate DOM, but it instead allows you to dynamically
set what you want the results of $('foo').find(some_selector)
to be.
Before this commit, we were erroneously setting up parents
as part of add_child() calls, but it's not necessarily the
case that those children are immediate children, and therefore
the first object is not necessarily the immediate parent.
jQuery's behavior in methods that, because of their nature, don't need to
return anything is to return the element itself in the jQuery object form.
Now the zjquery element is returned when one of these methods is called.
There are some cases when the jQuery dollar
function is called with an element as argument.
If such element has already been created using
zjquery, we should simply return it.
We now make it so that $('foo').addClass(whatever) and similar
functions properly return the wrapper object for chaining
purposes. We may eventually want to change the wrapper object
to automatically dispatch to the first child object, but this
should work for now.