EaseInCirc Crash

[cliftonlabrum]

Tapping EaseInCirc in the iPad simulator produced a crash.

`Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer bounds contains NaN: [nan nan; nan nan]'

Screenshot:

Mmmm.... naan...

[atomkirk]

sorry for not responding, I didn't realize my account wasn't "watching" this repo. I'll look into this.