Popup demo: Updating 'jQuery' to 1.9.1
Menubar: move to next item applied focus() to too many items

`_move` was believed to specify just one item,
called `focusableTarget`.  Using the broader
selectors this would return anything matching `a` or
`button`.  This means that the next item _as well
as_ any `button`s or `a`s found thereunder would
_also_ have their focus() event fired.
Menubar: Bug:  Arrow right w/ open submenu error

1.  Load page
1.  Tab to first bar
1.  Right cursor
1.  Down cursor
1.  Right cursor
1.  Error

Test the object that is tested for an `active` for
definition before querying that property.

Create new method for assessing whether or not a
new submenu should be opened. The testing here is
a smell.  This logic should be simplified.