Added two override method

Added two method, they are "ActionSlideExpandableListView.setAdapter" and  "SlideExpandableListView.setAdapter".
Now, you can use custom layout name,that two layout name "expandable" and "expandable_toggle_button" could be  changed,considering this widget may be widely used in activity or fragment.
So the naming should base on specification.
The original usage is like "list.setAdapter(buildDummyData());".
Now, You can use "list.setAdapter(buildDummyData (),R.id.item_layout,R.id.button_layout);".

thanks.