Ref #49 - Implemented the somewhat confusing logic for converting a List of MovieItems into the required data structure for use with the SimpleExpandableListAdapter. Added an additional MovieItem method which converts the object over to a Map...specifically for use with these Android "simple" adapters.
Getting rid of this Set data.  Will add it back when it's time to actually use it.
Ref #49 - Hooked up the SimpleExpandableListAdapter demo.  Can now launch and see it in action.
Ref #49 - Can now click to update child value. Added public Keys in MovieItem so as to access the Map values easily.
Ref #49 - Added toast for not supporting clear. Android expandable demo now supports saving/restoring state. Also supports resetting adapter.