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!