Create gameController object
Add Audio Source to gameController

* Audio Clip = Assets/Audio/music_normal.ogg
* 2D sound
* Play on Awake
* Loop
Add secondaryMusic object to gameController

* secondaryMusic is a child of gameController
* Audio Source
  + Audio Clip = Assets/Audio/music_panic.ogg
  + 2D sound
  + Play on Awake
  + Loop
  + Volume = 0 (don't play on game start)
Add LastPlayerSighting.cs script to gameController
Turn gameController into a prefab
Merge branch 'game-controller'
Add missing lights_baked prefab to git