nds4droid release 21

Time for a new nds4droid release! Get it on Google Play and sourceforge Here’s the deal:

• Better OUYA support (thanks @HeinousGames)
• Minor performance enhancements
• Increased default frame skip from 1 to 3

Big shoutout to Heinous Games for letting me try use their development OUYA to test it out. Check out their apps on Google Play!

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