menubutton improvement: Show the menu only on button click event

[ryupanqui]

I suggest add a menubutton property to automatically show the menu when mouse enter button, default true, because sometimes i want to show the menu only on button click event. Something like 'showOnMouseEnter' property:

Code:

.bind("mouseenter.menubutton", function() {
	// - BEGIN EDIT
	if (!opts.showOnMouseEnter) return false;
	// - END EDIT
	_3ea = setTimeout(function() {
		_3eb(_3e8);
	}, opts.duration);
	return false;
})