Use CVDisplayLink

[chriseidhof]

I wanted to use this but then discovered that animation is done using a timer... it'd be really cool to use CVDisplayLink instead. Should be much more reliable for smooth animations.

[kelan]

Very good suggestion. I admittedly wrote this long ago, so I don't claim it to be great code. But, there have been a few forks to improve things, so it's probably worthing pulling them all together, and making this improvement too. I'll try to use this needling from you as motivation to do that. =)