Added SKPhysicsContactDelegate Protocol in order to use didBeginContact and didEndContact methods
Added Detection of Contacted Physics Body to remove brick on contact with ball
Removed superfluous code
Added Sound Effect in CAF format loading and action to play on contact with paddle object
Refactored for efficiency to reuse Sound Effect as Property and Load during Scene initialisation

Avoids recreating the sound everytime it hits the paddle
Added Sound Effect for Brick Contact
Added BottomEdge and Category with SKNode. Added a 'You Lose' with SKLabelNode
Added Shadow to You Lose label
Added 2nd View for Game Over Scene and transition Effect
Added Retry Game Button on Tap with Animation. Imported First scene. Added game over sound.
Added Particle Effects
Added minor Gravity. Added Contact between Paddle and Bottom Edge causing player to die. Made Paddle Dynamic
Added Logo and TouchPaddle Force
Merge pull request #2 from ltfschoen/20140616

Merge