1. fixed the concurrentModificationException thrown by HashMapIterator
of ViewGroup class by making: PuzzleActivity OnDropCompleted method
gridView and its code run in a different thread at a later part of time.
2.fixed the touch scroll issue by listeing to onTouchEvent and doing a
no op  on ACTION DOWN, MOVE and UP case.
3. added previous and next button images.
4. changed the appearance of play, back and preview button
5. changed the positions of back and preview button
6. organized the info of very image to approximately 350 characters.
7. changed the order of the images and added 2 new images.
8. changed the puzzle pieces text  to Select puzzle pieces.
9. cleaned all commented code in xml and source.
10. removed unused images and audio files.
11. removed the large-layout folder
12. removed the values-11 and values-14 folder
13. removed exit dialog and  puzzle solved xml files
14. cleaned the source files.