Make Cozmo Turn Towards Cube on Tap

[gbroques]

When a player taps a cube, Cozmo should turn towards the cube to make it seem like he's watching what the player does.

This will provide a more engaging experience.

Another idea is that Cozmo only turns to the cube on tap sometimes.

This would make Cozmo seem more life-like.

IMPLEMENTATION DETAILS

We should add a turn_to_cube(cube_id) method to the SongRobot class.

NOTE: This is different than Cozmo turning to TAP the cubes.

This issue closely relates to issue #22.

The following link may prove helpful:

http:https://cozmosdk.anki.com/docs/generated/cozmo.anim.html#cozmo.anim.Triggers.MemoryMatchCozmoFollowTapsSoundOnly