ItemRemovedListener added for SwipePlaceHolderView

SwipePlaceHolderView will now accept ItemRemovedListener. It will listen to the itemView remove events. onItemRemoved method will be called with the count of the current items in the view list after the view removal.

    mSwipePlaceHolderView.addItemRemoveListener(new ItemRemovedListener() {

        @Override
        public void onItemRemoved(int count) {
            //do something when the count changes to some specific value.
            //For Example: Call server to fetch more data when count is zero
        }
    });