FaceIt

The demo of CS193P lecture 13.

Showing how to use NSTimer(now is Timer), and Animation

Feature

1. add BlinkFaceViewControler to controll blink eyes.

   1. using Timer to close and open eyes automatically.
   2. change eye to EyeView so can transition in Timer.

2. make head shake.

   1. change tap gesture action to another func.
   2. add animation to faceView(transform.rotated func to shake)