File count

As discussed and requested in #214 
As you know, when a long press is done in an item of the list, a contextual menu with different options appears. I see that you are including the footer view as an item in the last position (I am not sure if as an item is the best way), but there is not code related with this element on this onCreateContextMenu() method. Take care that no crash appears if user does long press on that item...