We should add @slides variable

[ezhlobo]

Now we use @slides method to get collection of slides. We must add @slides variable instead method to cache it collection. Work should looks like:

slider = new Flow 'slider'

slider.slides # return collection of all slides

slider.append '<li>new slide</li>'
slider.slides # return collection of all slides after appending

slider.list.append '<li>new slide</li>'
slider.slides # and after native appending this should return coollection of all slides

It's so necessary because jquery.find() does not cache result and every call @slides method will be very slow.