Add white enemy plane
Rename PlaneEnemy to EnemyPlane
Rename PlanePlayer to PlayerPlane
Rename PlaneGreen to GreenEnemyPlane
Move the direction to Game Movable
Update classes accordingly
Add basic Bullet classes
Add Bullet Builder
Add plane actions
Add create and remove events for bullets
Listen to the bullet events in level
Add Below and Above level layers
Build the CoffeeScript
Update HTML page to reflect changes