15 Sliding Tile Puzzle

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Version 1.61
Using latest Google Play library.

Version 1.6
Splash screen added.

Version 1.5
Google Play services added.

Version 1.4
Removed crash bug when using the back button seen on some phones.

Version 1.3
Removed crash bug when using the back button.

Version 1.2
Added end of puzzle message to explain how to return to puzzle selection screen.

Version 1.1
Minor changes