Finish Enhacement #2. Particles + Restart click

Finish Enhacement #2. Particles + Restart click. To Add particles:
1) Activate flag of collision in collideAction()
2) In Update we check if collisionFlag is true
3) Error: createParticles not Define
4) Define createParticles function
5) Error: multiplier is not defined
6) Define multiplier in collideAction(ball,p)
7) Add emitParticles in Update()
8) Error: emitParticles is not define
9) Define emitParticles()
10) We finally add particlePos.y = ball.y + bar.r for the particles to
show above the paddle situated below

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